23691138 has 32 divisors (see below), whose sum is σ = 50595840. Its totient is φ = 7373520.

The previous prime is 23691113. The next prime is 23691163. The reversal of 23691138 is 83119632.

It is an interprime number because it is at equal distance from previous prime (23691113) and next prime (23691163).

It is a super-2 number, since 2×23691138² = 1122540039470088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23691099 and 23691108.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6631 + ... + 9557.

It is an arithmetic number, because the mean of its divisors is an integer number (1581120).

Almost surely, 2^23691138 is an apocalyptic number.

23691138 is an abundant number, since it is smaller than the sum of its proper divisors (26904702).

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

23691138 is a wasteful number, since it uses less digits than its factorization.

23691138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3022.

The product of its digits is 7776, while the sum is 33.

The square root of 23691138 is about 4867.3543121495. The cubic root of 23691138 is about 287.2071897213.

The spelling of 23691138 in words is "twenty-three million, six hundred ninety-one thousand, one hundred thirty-eight".