23978665 has 16 divisors (see below), whose sum is σ = 30484800. Its totient is φ = 18055872.

The previous prime is 23978659. The next prime is 23978677. The reversal of 23978665 is 56687932.

It is a cyclic number.

It is not a de Polignac number, because 23978665 - 2²¹ = 21881513 is a prime.

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, 15706 + ... + 17164.

It is an arithmetic number, because the mean of its divisors is an integer number (1905300).

Almost surely, 2^23978665 is an apocalyptic number.

It is an amenable number.

23978665 is a deficient number, since it is larger than the sum of its proper divisors (6506135).

23978665 is a wasteful number, since it uses less digits than its factorization.

23978665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656.

The product of its digits is 544320, while the sum is 46.

The square root of 23978665 is about 4896.8015071064. The cubic root of 23978665 is about 288.3644154033.

The spelling of 23978665 in words is "twenty-three million, nine hundred seventy-eight thousand, six hundred sixty-five".