18120972 has 24 divisors (see below), whose sum is σ = 43426096. Its totient is φ = 5876928.

The previous prime is 18120967. The next prime is 18120979. The reversal of 18120972 is 27902181.

It is not an unprimeable number, because it can be changed into a prime (18120979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19963 + ... + 20850.

Almost surely, 2^18120972 is an apocalyptic number.

18120972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18120972 is an abundant number, since it is smaller than the sum of its proper divisors (25305124).

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

18120972 is a wasteful number, since it uses less digits than its factorization.

18120972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40857 (or 40855 counting only the distinct ones).

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

The square root of 18120972 is about 4256.8735005870. The cubic root of 18120972 is about 262.6599333766.

The spelling of 18120972 in words is "eighteen million, one hundred twenty thousand, nine hundred seventy-two".