22718918 has 4 divisors (see below), whose sum is σ = 34078380. Its totient is φ = 11359458.

The previous prime is 22718909. The next prime is 22718923. The reversal of 22718918 is 81981722.

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

It is a super-2 number, since 2×22718918² = 1032298470181448, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5679728 + ... + 5679731.

It is an arithmetic number, because the mean of its divisors is an integer number (8519595).

Almost surely, 2^22718918 is an apocalyptic number.

22718918 is a deficient number, since it is larger than the sum of its proper divisors (11359462).

22718918 is a wasteful number, since it uses less digits than its factorization.

22718918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11359461.

The product of its digits is 16128, while the sum is 38.

The square root of 22718918 is about 4766.4366144952. The cubic root of 22718918 is about 283.2234538945.

The spelling of 22718918 in words is "twenty-two million, seven hundred eighteen thousand, nine hundred eighteen".