Search a number
-
+
639000 = 23325371
BaseRepresentation
bin10011100000000011000
31012110112200
42130000120
5130422000
621410200
75300655
oct2340030
91173480
10639000
113a70aa
12269960
13194b0b
14128c2c
15c9500
hex9c018

639000 has 96 divisors (see below), whose sum is σ = 2190240. Its totient is φ = 168000.

The previous prime is 638999. The next prime is 639007. The reversal of 639000 is 936.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a nialpdrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 639000.

It is not an unprimeable number, because it can be changed into a prime (639007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8965 + ... + 9035.

It is an arithmetic number, because the mean of its divisors is an integer number (22815).

2639000 is an apocalyptic number.

639000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1095120).

639000 is an abundant number, since it is smaller than the sum of its proper divisors (1551240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639000 is a wasteful number, since it uses less digits than its factorization.

639000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 639000 is about 799.3747556685. The cubic root of 639000 is about 86.1324801478.

Adding to 639000 its reverse (936), we get a palindrome (639936).

The spelling of 639000 in words is "six hundred thirty-nine thousand".

Divisors: 1 2 3 4 5 6 8 9 10 12 15 18 20 24 25 30 36 40 45 50 60 71 72 75 90 100 120 125 142 150 180 200 213 225 250 284 300 355 360 375 426 450 500 568 600 639 710 750 852 900 1000 1065 1125 1278 1420 1500 1704 1775 1800 2130 2250 2556 2840 3000 3195 3550 4260 4500 5112 5325 6390 7100 8520 8875 9000 10650 12780 14200 15975 17750 21300 25560 26625 31950 35500 42600 53250 63900 71000 79875 106500 127800 159750 213000 319500 639000