18031772 has 12 divisors (see below), whose sum is σ = 34424376. Its totient is φ = 8196240.

The previous prime is 18031753. The next prime is 18031787. The reversal of 18031772 is 27713081.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204863 + ... + 204950.

It is an arithmetic number, because the mean of its divisors is an integer number (2868698).

Almost surely, 2^18031772 is an apocalyptic number.

It is an amenable number.

18031772 is a deficient number, since it is larger than the sum of its proper divisors (16392604).

18031772 is a wasteful number, since it uses less digits than its factorization.

18031772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409828 (or 409826 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 18031772 is about 4246.3834023790. The cubic root of 18031772 is about 262.2282454435.

The spelling of 18031772 in words is "eighteen million, thirty-one thousand, seven hundred seventy-two".