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423640 = 23571789
BaseRepresentation
bin1100111011011011000
3210112010101
41213123120
5102024030
613025144
73413050
oct1473330
9715111
10423640
1126a318
121851b4
1311aa99
14b0560
15857ca
hex676d8

423640 has 64 divisors (see below), whose sum is σ = 1166400. Its totient is φ = 135168.

The previous prime is 423617. The next prime is 423649. The reversal of 423640 is 46324.

423640 = 1612 + 1622 + ... + 1752.

It is a zygodrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4716 + ... + 4804.

It is an arithmetic number, because the mean of its divisors is an integer number (18225).

2423640 is an apocalyptic number.

423640 is a gapful number since it is divisible by the number (40) 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 423640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (583200).

423640 is an abundant number, since it is smaller than the sum of its proper divisors (742760).

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

423640 is a wasteful number, since it uses less digits than its factorization.

423640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 423640 is about 650.8763323397. The cubic root of 423640 is about 75.1044470692.

Adding to 423640 its reverse (46324), we get a palindrome (469964).

The spelling of 423640 in words is "four hundred twenty-three thousand, six hundred forty".

Divisors: 1 2 4 5 7 8 10 14 17 20 28 34 35 40 56 68 70 85 89 119 136 140 170 178 238 280 340 356 445 476 595 623 680 712 890 952 1190 1246 1513 1780 2380 2492 3026 3115 3560 4760 4984 6052 6230 7565 10591 12104 12460 15130 21182 24920 30260 42364 52955 60520 84728 105910 211820 423640