18083990 has 8 divisors (see below), whose sum is σ = 32551200. Its totient is φ = 7233592.

The previous prime is 18083987. The next prime is 18084013. The reversal of 18083990 is 9938081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×18083990³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 904190 + ... + 904209.

It is an arithmetic number, because the mean of its divisors is an integer number (4068900).

Almost surely, 2^18083990 is an apocalyptic number.

18083990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18083990 is a deficient number, since it is larger than the sum of its proper divisors (14467210).

18083990 is a wasteful number, since it uses less digits than its factorization.

18083990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1808406.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 18083990 is about 4252.5274837442. The cubic root of 18083990 is about 262.4811294069.

The spelling of 18083990 in words is "eighteen million, eighty-three thousand, nine hundred ninety".