23978557 has 2 divisors, whose sum is σ = 23978558. Its totient is φ = 23978556.

The previous prime is 23978543. The next prime is 23978579. The reversal of 23978557 is 75587932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13147876 + 10830681 = 3626^2 + 3291^2 .

It is a cyclic number.

It is not a de Polignac number, because 23978557 - 2²³ = 15589949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23978527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11989278 + 11989279.

It is an arithmetic number, because the mean of its divisors is an integer number (11989279).

Almost surely, 2^23978557 is an apocalyptic number.

It is an amenable number.

23978557 is a deficient number, since it is larger than the sum of its proper divisors (1).

23978557 is an equidigital number, since it uses as much as digits as its factorization.

23978557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 529200, while the sum is 46.

The square root of 23978557 is about 4896.7904794876. The cubic root of 23978557 is about 288.3639824711.

The spelling of 23978557 in words is "twenty-three million, nine hundred seventy-eight thousand, five hundred fifty-seven".