18131330 has 16 divisors (see below), whose sum is σ = 37298880. Its totient is φ = 6216432.

The previous prime is 18131303. The next prime is 18131359. The reversal of 18131330 is 3313181.

It is a happy number.

It is a Curzon 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, 129440 + ... + 129579.

It is an arithmetic number, because the mean of its divisors is an integer number (2331180).

Almost surely, 2^18131330 is an apocalyptic number.

18131330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18131330 is an abundant number, since it is smaller than the sum of its proper divisors (19167550).

18131330 is a wasteful number, since it uses less digits than its factorization.

18131330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259033.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 18131330 is about 4258.0899473825. The cubic root of 18131330 is about 262.7099695700.

The spelling of 18131330 in words is "eighteen million, one hundred thirty-one thousand, three hundred thirty".