23978637 has 6 divisors (see below), whose sum is σ = 34635822. Its totient is φ = 15985752.

The previous prime is 23978623. The next prime is 23978651. The reversal of 23978637 is 73687932.

It is a happy number.

23978637 is a `hidden beast` number, since 2 + 3 + 9 + 7 + 8 + 637 = 666.

It is an interprime number because it is at equal distance from previous prime (23978623) and next prime (23978651).

It can be written as a sum of positive squares in only one way, i.e., 22553001 + 1425636 = 4749^2 + 1194^2 .

It is not a de Polignac number, because 23978637 - 2⁷ = 23978509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23978592 and 23978601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23978677) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1332138 + ... + 1332155.

It is an arithmetic number, because the mean of its divisors is an integer number (5772637).

Almost surely, 2^23978637 is an apocalyptic number.

It is an amenable number.

23978637 is a deficient number, since it is larger than the sum of its proper divisors (10657185).

23978637 is a wasteful number, since it uses less digits than its factorization.

23978637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2664299 (or 2664296 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 23978637 is about 4896.7986480965. The cubic root of 23978637 is about 288.3643031617.

The spelling of 23978637 in words is "twenty-three million, nine hundred seventy-eight thousand, six hundred thirty-seven".