18711672 has 64 divisors (see below), whose sum is σ = 53944320. Its totient is φ = 5298048.

The previous prime is 18711659. The next prime is 18711733. The reversal of 18711672 is 27611781.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 20898 + ... + 21774.

It is an arithmetic number, because the mean of its divisors is an integer number (842880).

Almost surely, 2^18711672 is an apocalyptic number.

18711672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18711672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26972160).

18711672 is an abundant number, since it is smaller than the sum of its proper divisors (35232648).

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

18711672 is a wasteful number, since it uses less digits than its factorization.

18711672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020 (or 1016 counting only the distinct ones).

The product of its digits is 4704, while the sum is 33.

The square root of 18711672 is about 4325.6990186558. The cubic root of 18711672 is about 265.4834984655.

The spelling of 18711672 in words is "eighteen million, seven hundred eleven thousand, six hundred seventy-two".