23199965 has 4 divisors (see below), whose sum is σ = 27839964. Its totient is φ = 18559968.

The previous prime is 23199959. The next prime is 23199983. The reversal of 23199965 is 56999132.

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 3892729 + 19307236 = 1973^2 + 4394^2 .

It is a cyclic number.

It is not a de Polignac number, because 23199965 - 2⁴ = 23199949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2319992 + ... + 2320001.

It is an arithmetic number, because the mean of its divisors is an integer number (6959991).

Almost surely, 2^23199965 is an apocalyptic number.

It is an amenable number.

23199965 is a deficient number, since it is larger than the sum of its proper divisors (4639999).

23199965 is an equidigital number, since it uses as much as digits as its factorization.

23199965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4639998.

The product of its digits is 131220, while the sum is 44.

The square root of 23199965 is about 4816.6341982758. The cubic root of 23199965 is about 285.2084860045.

The spelling of 23199965 in words is "twenty-three million, one hundred ninety-nine thousand, nine hundred sixty-five".