18487500 has 144 divisors (see below), whose sum is σ = 59058720. Its totient is φ = 4480000.

The previous prime is 18487499. The next prime is 18487507. The reversal of 18487500 is 578481.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18487507) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 637486 + ... + 637514.

It is an arithmetic number, because the mean of its divisors is an integer number (410130).

Almost surely, 2^18487500 is an apocalyptic number.

18487500 is a gapful number since it is divisible by the number (10) 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 18487500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29529360).

18487500 is an abundant number, since it is smaller than the sum of its proper divisors (40571220).

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

18487500 is a wasteful number, since it uses less digits than its factorization.

18487500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78 (or 56 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 18487500 is about 4299.7092924987. The cubic root of 18487500 is about 264.4190429560.

The spelling of 18487500 in words is "eighteen million, four hundred eighty-seven thousand, five hundred".