523638 has 16 divisors (see below), whose sum is σ = 1163760. Its totient is φ = 174528.

The previous prime is 523637. The next prime is 523639. The reversal of 523638 is 836325.

523638 is a `hidden beast` number, since 5 + 23 + 638 = 666.

It is an interprime number because it is at equal distance from previous prime (523637) and next prime (523639).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4795 + ... + 4902.

It is an arithmetic number, because the mean of its divisors is an integer number (72735).

2⁵²³⁶³⁸ is an apocalyptic number.

523638 is an abundant number, since it is smaller than the sum of its proper divisors (640122).

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

523638 is a wasteful number, since it uses less digits than its factorization.

523638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9708 (or 9702 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 523638 is about 723.6283576533. The cubic root of 523638 is about 80.6016103055.

The spelling of 523638 in words is "five hundred twenty-three thousand, six hundred thirty-eight".