22918643 has 4 divisors (see below), whose sum is σ = 25002168. Its totient is φ = 20835120.

The previous prime is 22918639. The next prime is 22918673. The reversal of 22918643 is 34681922.

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

It is a cyclic number.

It is not a de Polignac number, because 22918643 - 2² = 22918639 is a prime.

It is a super-2 number, since 2×22918643² = 1050528393922898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22918673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1041746 + ... + 1041767.

It is an arithmetic number, because the mean of its divisors is an integer number (6250542).

Almost surely, 2^22918643 is an apocalyptic number.

22918643 is a deficient number, since it is larger than the sum of its proper divisors (2083525).

22918643 is a wasteful number, since it uses less digits than its factorization.

22918643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2083524.

The product of its digits is 20736, while the sum is 35.

The square root of 22918643 is about 4787.3419556159. The cubic root of 22918643 is about 284.0509851927.

The spelling of 22918643 in words is "twenty-two million, nine hundred eighteen thousand, six hundred forty-three".