Base | Representation |
---|---|
bin | 10011100001111000000 |
3 | 1012111211100 |
4 | 2130033000 |
5 | 130434221 |
6 | 21414400 |
7 | 5303463 |
oct | 2341700 |
9 | 1174740 |
10 | 639936 |
11 | 3a7880 |
12 | 26a400 |
13 | 19537b |
14 | 1292da |
15 | c9926 |
hex | 9c3c0 |
639936 has 84 divisors (see below), whose sum is σ = 2020824. Its totient is φ = 192000.
The previous prime is 639911. The next prime is 639937.
639936 is nontrivially palindromic in base 10.
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a nude number because it is divisible by every one of its digits.
It is a self number, because there is not a number n which added to its sum of digits gives 639936.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (639937) by changing a digit.
639936 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6286 + ... + 6386.
2639936 is an apocalyptic number.
639936 is a gapful number since it is divisible by the number (66) 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 639936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1010412).
639936 is an abundant number, since it is smaller than the sum of its proper divisors (1380888).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
639936 is a wasteful number, since it uses less digits than its factorization.
639936 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 130 (or 117 counting only the distinct ones).
The product of its digits is 26244, while the sum is 36.
The square root of 639936 is about 799.9599989999. The cubic root of 639936 is about 86.1745149259.
It can be divided in two parts, 63 and 9936, that added together give a palindrome (9999).
The spelling of 639936 in words is "six hundred thirty-nine thousand, nine hundred thirty-six".
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