18487872 has 112 divisors (see below), whose sum is σ = 58602880. Its totient is φ = 5681664.

The previous prime is 18487867. The next prime is 18487879. The reversal of 18487872 is 27878481.

It is a super-2 number, since 2×18487872² = 683602822176768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18487879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22053 + ... + 22875.

It is an arithmetic number, because the mean of its divisors is an integer number (523240).

Almost surely, 2^18487872 is an apocalyptic number.

18487872 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 18487872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29301440).

18487872 is an abundant number, since it is smaller than the sum of its proper divisors (40115008).

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

18487872 is a wasteful number, since it uses less digits than its factorization.

18487872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857 (or 841 counting only the distinct ones).

The product of its digits is 200704, while the sum is 45.

The square root of 18487872 is about 4299.7525510197. The cubic root of 18487872 is about 264.4208164647.

The spelling of 18487872 in words is "eighteen million, four hundred eighty-seven thousand, eight hundred seventy-two".