18008990 has 16 divisors (see below), whose sum is σ = 33106752. Its totient is φ = 7050144.

The previous prime is 18008989. The next prime is 18008993. The reversal of 18008990 is 9980081.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18008990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18008993) by changing a digit.

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, 18689 + ... + 19628.

It is an arithmetic number, because the mean of its divisors is an integer number (2069172).

Almost surely, 2^18008990 is an apocalyptic number.

18008990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18008990 is a deficient number, since it is larger than the sum of its proper divisors (15097762).

18008990 is a wasteful number, since it uses less digits than its factorization.

18008990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38371.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 18008990 is about 4243.7000365247. The cubic root of 18008990 is about 262.1177626502.

The spelling of 18008990 in words is "eighteen million, eight thousand, nine hundred ninety".