18411972 has 12 divisors (see below), whose sum is σ = 42961296. Its totient is φ = 6137320.

The previous prime is 18411961. The next prime is 18411979. The reversal of 18411972 is 27911481.

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 (18411979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 767154 + ... + 767177.

It is an arithmetic number, because the mean of its divisors is an integer number (3580108).

Almost surely, 2^18411972 is an apocalyptic number.

18411972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18411972 is an abundant number, since it is smaller than the sum of its proper divisors (24549324).

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

18411972 is a wasteful number, since it uses less digits than its factorization.

18411972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1534338 (or 1534336 counting only the distinct ones).

The product of its digits is 4032, while the sum is 33.

The square root of 18411972 is about 4290.9173844296. The cubic root of 18411972 is about 264.0584696022.

The spelling of 18411972 in words is "eighteen million, four hundred eleven thousand, nine hundred seventy-two".