23490905 has 4 divisors (see below), whose sum is σ = 28189092. Its totient is φ = 18792720.

The previous prime is 23490881. The next prime is 23490911. The reversal of 23490905 is 50909432.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7706176 + 15784729 = 2776^2 + 3973^2 .

It is a de Polignac number, because none of the positive numbers 2^k-23490905 is a prime.

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

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 2349086 + ... + 2349095.

It is an arithmetic number, because the mean of its divisors is an integer number (7047273).

Almost surely, 2^23490905 is an apocalyptic number.

It is an amenable number.

23490905 is a deficient number, since it is larger than the sum of its proper divisors (4698187).

23490905 is an equidigital number, since it uses as much as digits as its factorization.

23490905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4698186.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 23490905 is about 4846.7416890113. The cubic root of 23490905 is about 286.3957591793.

The spelling of 23490905 in words is "twenty-three million, four hundred ninety thousand, nine hundred five".