18263990 has 8 divisors (see below), whose sum is σ = 32875200. Its totient is φ = 7305592.

The previous prime is 18263989. The next prime is 18264017. The reversal of 18263990 is 9936281.

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

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, 913190 + ... + 913209.

It is an arithmetic number, because the mean of its divisors is an integer number (4109400).

Almost surely, 2^18263990 is an apocalyptic number.

18263990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18263990 is a deficient number, since it is larger than the sum of its proper divisors (14611210).

18263990 is a wasteful number, since it uses less digits than its factorization.

18263990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1826406.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 18263990 is about 4273.6389646296. The cubic root of 18263990 is about 263.3491293557.

The spelling of 18263990 in words is "eighteen million, two hundred sixty-three thousand, nine hundred ninety".