18012972 has 12 divisors (see below), whose sum is σ = 42030296. Its totient is φ = 6004320.

The previous prime is 18012971. The next prime is 18012983. The reversal of 18012972 is 27921081.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (18012971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 750529 + ... + 750552.

Almost surely, 2^18012972 is an apocalyptic number.

18012972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18012972 is an abundant number, since it is smaller than the sum of its proper divisors (24017324).

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

18012972 is a wasteful number, since it uses less digits than its factorization.

18012972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501088 (or 1501086 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 18012972 is about 4244.1691766469. The cubic root of 18012972 is about 262.1370803357.

The spelling of 18012972 in words is "eighteen million, twelve thousand, nine hundred seventy-two".