23625721 has 16 divisors (see below), whose sum is σ = 29196160. Its totient is φ = 18662400.

The previous prime is 23625703. The next prime is 23625769. The reversal of 23625721 is 12752632.

It is a 4-Lehmer number, since φ(23625721) divides (23625721-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 23625721 - 2¹¹ = 23623673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23625721.

It is not an unprimeable number, because it can be changed into a prime (23625781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2521 + ... + 7321.

It is an arithmetic number, because the mean of its divisors is an integer number (1824760).

Almost surely, 2^23625721 is an apocalyptic number.

It is an amenable number.

23625721 is a deficient number, since it is larger than the sum of its proper divisors (5570439).

23625721 is a wasteful number, since it uses less digits than its factorization.

23625721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4864.

The product of its digits is 5040, while the sum is 28.

The square root of 23625721 is about 4860.6296917169. The cubic root of 23625721 is about 286.9425963775.

The spelling of 23625721 in words is "twenty-three million, six hundred twenty-five thousand, seven hundred twenty-one".