18087500 has 36 divisors (see below), whose sum is σ = 39591216. Its totient is φ = 7230000.

The previous prime is 18087481. The next prime is 18087523. The reversal of 18087500 is 578081.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11777 + ... + 13223.

It is an arithmetic number, because the mean of its divisors is an integer number (1099756).

Almost surely, 2^18087500 is an apocalyptic number.

18087500 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 18087500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19795608).

18087500 is an abundant number, since it is smaller than the sum of its proper divisors (21503716).

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

18087500 is an equidigital number, since it uses as much as digits as its factorization.

18087500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1476 (or 1454 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 18087500 is about 4252.9401594662. The cubic root of 18087500 is about 262.4981103417.

The spelling of 18087500 in words is "eighteen million, eighty-seven thousand, five hundred".