18531672 has 64 divisors (see below), whose sum is σ = 48837600. Its totient is φ = 5852160.

The previous prime is 18531641. The next prime is 18531673. The reversal of 18531672 is 27613581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18531673) 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 15 ways as a sum of consecutive naturals, for example, 36154 + ... + 36662.

Almost surely, 2^18531672 is an apocalyptic number.

18531672 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 18531672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24418800).

18531672 is an abundant number, since it is smaller than the sum of its proper divisors (30305928).

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

18531672 is a wasteful number, since it uses less digits than its factorization.

18531672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596 (or 592 counting only the distinct ones).

The product of its digits is 10080, while the sum is 33.

The square root of 18531672 is about 4304.8428542747. The cubic root of 18531672 is about 264.6294667209.

The spelling of 18531672 in words is "eighteen million, five hundred thirty-one thousand, six hundred seventy-two".