23978491 has 2 divisors, whose sum is σ = 23978492. Its totient is φ = 23978490.

The previous prime is 23978459. The next prime is 23978501. The reversal of 23978491 is 19487932.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23978491 - 2⁵ = 23978459 is a prime.

It is not a weakly prime, because it can be changed into another prime (23978401) by changing a digit.

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 as a sum of consecutive naturals, namely, 11989245 + 11989246.

It is an arithmetic number, because the mean of its divisors is an integer number (11989246).

Almost surely, 2^23978491 is an apocalyptic number.

23978491 is a deficient number, since it is larger than the sum of its proper divisors (1).

23978491 is an equidigital number, since it uses as much as digits as its factorization.

23978491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 23978491 is about 4896.7837403749. The cubic root of 23978491 is about 288.3637179009.

The spelling of 23978491 in words is "twenty-three million, nine hundred seventy-eight thousand, four hundred ninety-one".