23872391 has 2 divisors, whose sum is σ = 23872392. Its totient is φ = 23872390.

The previous prime is 23872361. The next prime is 23872393. The reversal of 23872391 is 19327832.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23872391 is a prime.

It is a Sophie Germain prime.

Together with 23872393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23872393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11936195 + 11936196.

It is an arithmetic number, because the mean of its divisors is an integer number (11936196).

Almost surely, 2^23872391 is an apocalyptic number.

23872391 is a deficient number, since it is larger than the sum of its proper divisors (1).

23872391 is an equidigital number, since it uses as much as digits as its factorization.

23872391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 23872391 is about 4885.9380880236. The cubic root of 23872391 is about 287.9377718884.

The spelling of 23872391 in words is "twenty-three million, eight hundred seventy-two thousand, three hundred ninety-one".