18123972 has 24 divisors (see below), whose sum is σ = 44777376. Its totient is φ = 5685888.

The previous prime is 18123953. The next prime is 18123979. The reversal of 18123972 is 27932181.

It is a super-2 number, since 2×18123972² = 656956722113568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18123979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44218 + ... + 44625.

It is an arithmetic number, because the mean of its divisors is an integer number (1865724).

Almost surely, 2^18123972 is an apocalyptic number.

18123972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18123972 is an abundant number, since it is smaller than the sum of its proper divisors (26653404).

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

18123972 is a wasteful number, since it uses less digits than its factorization.

18123972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88867 (or 88865 counting only the distinct ones).

The product of its digits is 6048, while the sum is 33.

The square root of 18123972 is about 4257.2258572925. The cubic root of 18123972 is about 262.6744273806.

The spelling of 18123972 in words is "eighteen million, one hundred twenty-three thousand, nine hundred seventy-two".