23415921 has 9 divisors (see below), whose sum is σ = 33843979. Its totient is φ = 15600936.

The previous prime is 23415911. The next prime is 23415929. The reversal of 23415921 is 12951432.

The square root of 23415921 is 4839.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 14630625 + 8785296 = 3825^2 + 2964^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 23415921 - 2⁷ = 23415793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23415929) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 13711 + ... + 15323.

Almost surely, 2^23415921 is an apocalyptic number.

23415921 is the 4839-th square number.

23415921 is the 2420-th centered octagonal number.

It is an amenable number.

23415921 is a deficient number, since it is larger than the sum of its proper divisors (10428058).

23415921 is an frugal number, since it uses more digits than its factorization.

23415921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3232 (or 1616 counting only the distinct ones).

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

The cubic root of 23415921 is about 286.0907050880.

It can be divided in two parts, 23415 and 921, that added together give a square (24336 = 156²).

The spelling of 23415921 in words is "twenty-three million, four hundred fifteen thousand, nine hundred twenty-one".