18604872 has 144 divisors (see below), whose sum is σ = 59950800. Its totient is φ = 5166720.

The previous prime is 18604871. The next prime is 18604879. The reversal of 18604872 is 27840681.

It is a super-2 number, since 2×18604872² = 692282524272768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18604871) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 133779 + ... + 133917.

It is an arithmetic number, because the mean of its divisors is an integer number (416325).

Almost surely, 2^18604872 is an apocalyptic number.

18604872 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 18604872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29975400).

18604872 is an abundant number, since it is smaller than the sum of its proper divisors (41345928).

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

18604872 is a wasteful number, since it uses less digits than its factorization.

18604872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 18604872 is about 4313.3365275619. The cubic root of 18604872 is about 264.9774372626.

The spelling of 18604872 in words is "eighteen million, six hundred four thousand, eight hundred seventy-two".