23638840 has 32 divisors (see below), whose sum is σ = 56317680. Its totient is φ = 8899072.

The previous prime is 23638807. The next prime is 23638843. The reversal of 23638840 is 4883632.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 23638796 and 23638805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23638843) 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, 16702 + ... + 18061.

Almost surely, 2^23638840 is an apocalyptic number.

23638840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23638840 is an abundant number, since it is smaller than the sum of its proper divisors (32678840).

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

23638840 is a wasteful number, since it uses less digits than its factorization.

23638840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34791 (or 34787 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 23638840 is about 4861.9790209338. The cubic root of 23638840 is about 286.9956981553.

The spelling of 23638840 in words is "twenty-three million, six hundred thirty-eight thousand, eight hundred forty".