23990913 has 12 divisors (see below), whose sum is σ = 35012068. Its totient is φ = 15828480.

The previous prime is 23990899. The next prime is 23990921. The reversal of 23990913 is 31909932.

It can be written as a sum of positive squares in 2 ways, for example, as 18173169 + 5817744 = 4263^2 + 2412^2 .

It is not a de Polignac number, because 23990913 - 2⁹ = 23990401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23990963) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12868 + ... + 14613.

Almost surely, 2^23990913 is an apocalyptic number.

It is an amenable number.

23990913 is a deficient number, since it is larger than the sum of its proper divisors (11021155).

23990913 is a wasteful number, since it uses less digits than its factorization.

23990913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27584 (or 27581 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 23990913 is about 4898.0519597081. The cubic root of 23990913 is about 288.4135046830.

The spelling of 23990913 in words is "twenty-three million, nine hundred ninety thousand, nine hundred thirteen".