23970721 has 2 divisors, whose sum is σ = 23970722. Its totient is φ = 23970720.

The previous prime is 23970701. The next prime is 23970827. The reversal of 23970721 is 12707932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17943696 + 6027025 = 4236^2 + 2455^2 .

It is a cyclic number.

It is not a de Polignac number, because 23970721 - 2¹⁷ = 23839649 is a prime.

It is not a weakly prime, because it can be changed into another prime (23970701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11985360 + 11985361.

It is an arithmetic number, because the mean of its divisors is an integer number (11985361).

Almost surely, 2^23970721 is an apocalyptic number.

It is an amenable number.

23970721 is a deficient number, since it is larger than the sum of its proper divisors (1).

23970721 is an equidigital number, since it uses as much as digits as its factorization.

23970721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 23970721 is about 4895.9902981930. The cubic root of 23970721 is about 288.3325673704.

The spelling of 23970721 in words is "twenty-three million, nine hundred seventy thousand, seven hundred twenty-one".