23493721 has 2 divisors, whose sum is σ = 23493722. Its totient is φ = 23493720.

The previous prime is 23493713. The next prime is 23493733. The reversal of 23493721 is 12739432.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23425600 + 68121 = 4840^2 + 261^2 .

It is a cyclic number.

It is not a de Polignac number, because 23493721 - 2³ = 23493713 is a prime.

It is not a weakly prime, because it can be changed into another prime (23493121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11746860 + 11746861.

It is an arithmetic number, because the mean of its divisors is an integer number (11746861).

Almost surely, 2^23493721 is an apocalyptic number.

It is an amenable number.

23493721 is a deficient number, since it is larger than the sum of its proper divisors (1).

23493721 is an equidigital number, since it uses as much as digits as its factorization.

23493721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 31.

The square root of 23493721 is about 4847.0321847498. The cubic root of 23493721 is about 286.4072027321.

The spelling of 23493721 in words is "twenty-three million, four hundred ninety-three thousand, seven hundred twenty-one".