23997391 has 4 divisors (see below), whose sum is σ = 26178984. Its totient is φ = 21815800.

The previous prime is 23997383. The next prime is 23997419. The reversal of 23997391 is 19379932.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23997391 - 2³ = 23997383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23997091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1090780 + ... + 1090801.

It is an arithmetic number, because the mean of its divisors is an integer number (6544746).

Almost surely, 2^23997391 is an apocalyptic number.

23997391 is a deficient number, since it is larger than the sum of its proper divisors (2181593).

23997391 is a wasteful number, since it uses less digits than its factorization.

23997391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2181592.

The product of its digits is 91854, while the sum is 43.

The square root of 23997391 is about 4898.7131983818. The cubic root of 23997391 is about 288.4394613796.

The spelling of 23997391 in words is "twenty-three million, nine hundred ninety-seven thousand, three hundred ninety-one".