22493218 has 16 divisors (see below), whose sum is σ = 38408256. Its totient is φ = 9779440.

The previous prime is 22493209. The next prime is 22493221. The reversal of 22493218 is 81239422.

It is a self number, because there is not a number n which added to its sum of digits gives 22493218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21721 + ... + 22732.

It is an arithmetic number, because the mean of its divisors is an integer number (2400516).

Almost surely, 2^22493218 is an apocalyptic number.

22493218 is a deficient number, since it is larger than the sum of its proper divisors (15915038).

22493218 is a wasteful number, since it uses less digits than its factorization.

22493218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44489.

The product of its digits is 6912, while the sum is 31.

The square root of 22493218 is about 4742.7015508041. The cubic root of 22493218 is about 282.2824408968.

The spelling of 22493218 in words is "twenty-two million, four hundred ninety-three thousand, two hundred eighteen".