18081330 has 16 divisors (see below), whose sum is σ = 43395264. Its totient is φ = 4821680.

The previous prime is 18081313. The next prime is 18081337. The reversal of 18081330 is 3318081.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18081330.

It is not an unprimeable number, because it can be changed into a prime (18081337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301326 + ... + 301385.

It is an arithmetic number, because the mean of its divisors is an integer number (2712204).

Almost surely, 2^18081330 is an apocalyptic number.

18081330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18081330 is an abundant number, since it is smaller than the sum of its proper divisors (25313934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18081330 is a wasteful number, since it uses less digits than its factorization.

18081330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602721.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 18081330 is about 4252.2147170622. The cubic root of 18081330 is about 262.4682592007.

The spelling of 18081330 in words is "eighteen million, eighty-one thousand, three hundred thirty".