23979565 has 4 divisors (see below), whose sum is σ = 28775484. Its totient is φ = 19183648.

The previous prime is 23979563. The next prime is 23979583. The reversal of 23979565 is 56597932.

It is a happy number.

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 16597476 + 7382089 = 4074^2 + 2717^2 .

It is a cyclic number.

It is not a de Polignac number, because 23979565 - 2¹ = 23979563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23979563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2397952 + ... + 2397961.

It is an arithmetic number, because the mean of its divisors is an integer number (7193871).

Almost surely, 2^23979565 is an apocalyptic number.

It is an amenable number.

23979565 is a deficient number, since it is larger than the sum of its proper divisors (4795919).

23979565 is an equidigital number, since it uses as much as digits as its factorization.

23979565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4795918.

The product of its digits is 510300, while the sum is 46.

The square root of 23979565 is about 4896.8934029648. The cubic root of 23979565 is about 288.3680231205.

The spelling of 23979565 in words is "twenty-three million, nine hundred seventy-nine thousand, five hundred sixty-five".