23992987 has 2 divisors, whose sum is σ = 23992988. Its totient is φ = 23992986.

The previous prime is 23992961. The next prime is 23992993. The reversal of 23992987 is 78929932.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23992987 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23992987.

It is not a weakly prime, because it can be changed into another prime (23992907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11996493 + 11996494.

It is an arithmetic number, because the mean of its divisors is an integer number (11996494).

Almost surely, 2^23992987 is an apocalyptic number.

23992987 is a deficient number, since it is larger than the sum of its proper divisors (1).

23992987 is an equidigital number, since it uses as much as digits as its factorization.

23992987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 49.

The square root of 23992987 is about 4898.2636719556. The cubic root of 23992987 is about 288.4218155015.

The spelling of 23992987 in words is "twenty-three million, nine hundred ninety-two thousand, nine hundred eighty-seven".