23665643 has 4 divisors (see below), whose sum is σ = 24694608. Its totient is φ = 22636680.

The previous prime is 23665637. The next prime is 23665657. The reversal of 23665643 is 34656632.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23665643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23665633) 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, 514448 + ... + 514493.

It is an arithmetic number, because the mean of its divisors is an integer number (6173652).

Almost surely, 2^23665643 is an apocalyptic number.

23665643 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

23665643 is a deficient number, since it is larger than the sum of its proper divisors (1028965).

23665643 is a wasteful number, since it uses less digits than its factorization.

23665643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028964.

The product of its digits is 77760, while the sum is 35.

The square root of 23665643 is about 4864.7346279114. The cubic root of 23665643 is about 287.1041276185.

The spelling of 23665643 in words is "twenty-three million, six hundred sixty-five thousand, six hundred forty-three".