18090388 has 24 divisors (see below), whose sum is σ = 32256000. Its totient is φ = 8876448.

The previous prime is 18090379. The next prime is 18090409. The reversal of 18090388 is 88309081.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75573 + ... + 75811.

It is an arithmetic number, because the mean of its divisors is an integer number (1344000).

Almost surely, 2^18090388 is an apocalyptic number.

It is an amenable number.

18090388 is a deficient number, since it is larger than the sum of its proper divisors (14165612).

18090388 is a wasteful number, since it uses less digits than its factorization.

18090388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519 (or 517 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 18090388 is about 4253.2796757326. The cubic root of 18090388 is about 262.5120804720.

The spelling of 18090388 in words is "eighteen million, ninety thousand, three hundred eighty-eight".