23878721 has 2 divisors, whose sum is σ = 23878722. Its totient is φ = 23878720.

The previous prime is 23878703. The next prime is 23878741. The reversal of 23878721 is 12787832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18879025 + 4999696 = 4345^2 + 2236^2 .

It is a cyclic number.

It is not a de Polignac number, because 23878721 - 2¹⁴ = 23862337 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is equal to p_1499951 and since 23878721 and 1499951 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (23878741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11939360 + 11939361.

It is an arithmetic number, because the mean of its divisors is an integer number (11939361).

Almost surely, 2^23878721 is an apocalyptic number.

It is an amenable number.

23878721 is a deficient number, since it is larger than the sum of its proper divisors (1).

23878721 is an equidigital number, since it uses as much as digits as its factorization.

23878721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 38.

The square root of 23878721 is about 4886.5858224327. The cubic root of 23878721 is about 287.9632194863.

The spelling of 23878721 in words is "twenty-three million, eight hundred seventy-eight thousand, seven hundred twenty-one".