18116990 has 16 divisors (see below), whose sum is σ = 33226848. Its totient is φ = 7109856.

The previous prime is 18116977. The next prime is 18117023. The reversal of 18116990 is 9961181.

It is a self number, because there is not a number n which added to its sum of digits gives 18116990.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16562 + ... + 17621.

It is an arithmetic number, because the mean of its divisors is an integer number (2076678).

Almost surely, 2^18116990 is an apocalyptic number.

18116990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18116990 is a deficient number, since it is larger than the sum of its proper divisors (15109858).

18116990 is a wasteful number, since it uses less digits than its factorization.

18116990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34243.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 18116990 is about 4256.4057607329. The cubic root of 18116990 is about 262.6406925310.

It can be divided in two parts, 181 and 16990, that added together give a palindrome (17171).

The spelling of 18116990 in words is "eighteen million, one hundred sixteen thousand, nine hundred ninety".