18787090 has 48 divisors (see below), whose sum is σ = 41072832. Its totient is φ = 6157536.

The previous prime is 18787079. The next prime is 18787121. The reversal of 18787090 is 9078781.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10437 + ... + 12103.

It is an arithmetic number, because the mean of its divisors is an integer number (855684).

Almost surely, 2^18787090 is an apocalyptic number.

18787090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18787090 is an abundant number, since it is smaller than the sum of its proper divisors (22285742).

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

18787090 is a wasteful number, since it uses less digits than its factorization.

18787090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1711 (or 1704 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 18787090 is about 4334.4076873317. The cubic root of 18787090 is about 265.8397002785.

The spelling of 18787090 in words is "eighteen million, seven hundred eighty-seven thousand, ninety".