23981636 has 12 divisors (see below), whose sum is σ = 47963328. Its totient is φ = 10277832.

The previous prime is 23981623. The next prime is 23981641. The reversal of 23981636 is 63618932.

23981636 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 23981636.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 428216 + ... + 428271.

It is an arithmetic number, because the mean of its divisors is an integer number (3996944).

Almost surely, 2^23981636 is an apocalyptic number.

It is an amenable number.

23981636 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

23981636 is a wasteful number, since it uses less digits than its factorization.

23981636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856498 (or 856496 counting only the distinct ones).

The product of its digits is 46656, while the sum is 38.

The square root of 23981636 is about 4897.1048589958. The cubic root of 23981636 is about 288.3763245358.

The spelling of 23981636 in words is "twenty-three million, nine hundred eighty-one thousand, six hundred thirty-six".