23915421 has 12 divisors (see below), whose sum is σ = 34587072. Its totient is φ = 15923976.

The previous prime is 23915417. The next prime is 23915429. The reversal of 23915421 is 12451932.

23915421 is a `hidden beast` number, since 239 + 1 + 5 + 421 = 666.

It is not a de Polignac number, because 23915421 - 2² = 23915417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23915429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12490 + ... + 14276.

It is an arithmetic number, because the mean of its divisors is an integer number (2882256).

Almost surely, 2^23915421 is an apocalyptic number.

It is an amenable number.

23915421 is a deficient number, since it is larger than the sum of its proper divisors (10671651).

23915421 is a wasteful number, since it uses less digits than its factorization.

23915421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3280 (or 3277 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 23915421 is about 4890.3395587628. The cubic root of 23915421 is about 288.1106707191.

It can be divided in two parts, 23915 and 421, that added together give a square (24336 = 156²).

The spelling of 23915421 in words is "twenty-three million, nine hundred fifteen thousand, four hundred twenty-one".