23865991 has 2 divisors, whose sum is σ = 23865992. Its totient is φ = 23865990.

The previous prime is 23865901. The next prime is 23866013. The reversal of 23865991 is 19956832.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23865991 - 2²³ = 15477383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23865901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11932995 + 11932996.

It is an arithmetic number, because the mean of its divisors is an integer number (11932996).

Almost surely, 2^23865991 is an apocalyptic number.

23865991 is a deficient number, since it is larger than the sum of its proper divisors (1).

23865991 is an equidigital number, since it uses as much as digits as its factorization.

23865991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 43.

The square root of 23865991 is about 4885.2831033626. The cubic root of 23865991 is about 287.9120383057.

The spelling of 23865991 in words is "twenty-three million, eight hundred sixty-five thousand, nine hundred ninety-one".