23721589 has 2 divisors, whose sum is σ = 23721590. Its totient is φ = 23721588.

The previous prime is 23721571. The next prime is 23721629. The reversal of 23721589 is 98512732.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21808900 + 1912689 = 4670^2 + 1383^2 .

It is a cyclic number.

It is not a de Polignac number, because 23721589 - 2⁷ = 23721461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23721539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11860794 + 11860795.

It is an arithmetic number, because the mean of its divisors is an integer number (11860795).

Almost surely, 2^23721589 is an apocalyptic number.

It is an amenable number.

23721589 is a deficient number, since it is larger than the sum of its proper divisors (1).

23721589 is an equidigital number, since it uses as much as digits as its factorization.

23721589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 23721589 is about 4870.4813930453. The cubic root of 23721589 is about 287.3301893248.

It can be divided in two parts, 23721 and 589, that added together give a triangular number (24310 = T₂₂₀).

The spelling of 23721589 in words is "twenty-three million, seven hundred twenty-one thousand, five hundred eighty-nine".