18212772 has 24 divisors (see below), whose sum is σ = 42614656. Its totient is φ = 6054048.

The previous prime is 18212749. The next prime is 18212807. The reversal of 18212772 is 27721281.

It is a happy 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 in 7 ways as a sum of consecutive naturals, for example, 2853 + ... + 6675.

Almost surely, 2^18212772 is an apocalyptic number.

18212772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18212772 is an abundant number, since it is smaller than the sum of its proper divisors (24401884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18212772 is a wasteful number, since it uses less digits than its factorization.

18212772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4227 (or 4225 counting only the distinct ones).

The product of its digits is 3136, while the sum is 30.

The square root of 18212772 is about 4267.6424405051. The cubic root of 18212772 is about 263.1027274870.

The spelling of 18212772 in words is "eighteen million, two hundred twelve thousand, seven hundred seventy-two".