23391945 has 48 divisors (see below), whose sum is σ = 43243200. Its totient is φ = 11664000.

The previous prime is 23391941. The next prime is 23392007. The reversal of 23391945 is 54919332.

It is a happy number.

It is not a de Polignac number, because 23391945 - 2² = 23391941 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23391941) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 93070 + ... + 93320.

It is an arithmetic number, because the mean of its divisors is an integer number (900900).

Almost surely, 2^23391945 is an apocalyptic number.

It is an amenable number.

23391945 is a deficient number, since it is larger than the sum of its proper divisors (19851255).

23391945 is a wasteful number, since it uses less digits than its factorization.

23391945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390 (or 387 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 23391945 is about 4836.5219941607. The cubic root of 23391945 is about 285.9930271989.

It can be divided in two parts, 23391 and 945, that added together give a square (24336 = 156²).

The spelling of 23391945 in words is "twenty-three million, three hundred ninety-one thousand, nine hundred forty-five".