23981436 has 36 divisors (see below), whose sum is σ = 61020232. Its totient is φ = 7941024.

The previous prime is 23981413. The next prime is 23981443. The reversal of 23981436 is 63418932.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 23981436.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3531 + ... + 7773.

Almost surely, 2^23981436 is an apocalyptic number.

It is an amenable number.

23981436 is an abundant number, since it is smaller than the sum of its proper divisors (37038796).

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

23981436 is a wasteful number, since it uses less digits than its factorization.

23981436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4410 (or 4405 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 23981436 is about 4897.0844387247. The cubic root of 23981436 is about 288.3755228748.

The spelling of 23981436 in words is "twenty-three million, nine hundred eighty-one thousand, four hundred thirty-six".