23209965 has 12 divisors (see below), whose sum is σ = 40230684. Its totient is φ = 12378624.

The previous prime is 23209931. The next prime is 23209973. The reversal of 23209965 is 56990232.

It can be written as a sum of positive squares in 2 ways, for example, as 10614564 + 12595401 = 3258^2 + 3549^2 .

It is not a de Polignac number, because 23209965 - 2¹⁴ = 23193581 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 257844 + ... + 257933.

It is an arithmetic number, because the mean of its divisors is an integer number (3352557).

Almost surely, 2^23209965 is an apocalyptic number.

It is an amenable number.

23209965 is a deficient number, since it is larger than the sum of its proper divisors (17020719).

23209965 is a wasteful number, since it uses less digits than its factorization.

23209965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515788 (or 515785 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 23209965 is about 4817.6721557200. The cubic root of 23209965 is about 285.2494584108.

The spelling of 23209965 in words is "twenty-three million, two hundred nine thousand, nine hundred sixty-five".