23378721 has 12 divisors (see below), whose sum is σ = 32900112. Its totient is φ = 14764824.

The previous prime is 23378717. The next prime is 23378731. The reversal of 23378721 is 12787332.

It is not a de Polignac number, because 23378721 - 2² = 23378717 is a prime.

It is a super-3 number, since 3×23378721³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23378711) 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, 9711 + ... + 11876.

It is an arithmetic number, because the mean of its divisors is an integer number (2741676).

Almost surely, 2^23378721 is an apocalyptic number.

It is an amenable number.

23378721 is a deficient number, since it is larger than the sum of its proper divisors (9521391).

23378721 is a wasteful number, since it uses less digits than its factorization.

23378721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21628 (or 21609 counting only the distinct ones).

The product of its digits is 14112, while the sum is 33.

The square root of 23378721 is about 4835.1547027991. The cubic root of 23378721 is about 285.9391242465.

The spelling of 23378721 in words is "twenty-three million, three hundred seventy-eight thousand, seven hundred twenty-one".