18389772 has 18 divisors (see below), whose sum is σ = 46485348. Its totient is φ = 6129912.

The previous prime is 18389759. The next prime is 18389779. The reversal of 18389772 is 27798381.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (18389779) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 255378 + ... + 255449.

Almost surely, 2^18389772 is an apocalyptic number.

18389772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18389772 is an abundant number, since it is smaller than the sum of its proper divisors (28095576).

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

18389772 is a wasteful number, since it uses less digits than its factorization.

18389772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510837 (or 510832 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 18389772 is about 4288.3297447841. The cubic root of 18389772 is about 263.9522985440.

The spelling of 18389772 in words is "eighteen million, three hundred eighty-nine thousand, seven hundred seventy-two".