18133330 has 16 divisors (see below), whose sum is σ = 33522840. Its totient is φ = 7057152.

The previous prime is 18133321. The next prime is 18133331. The reversal of 18133330 is 3333181.

It can be written as a sum of positive squares in 4 ways, for example, as 12243001 + 5890329 = 3499^2 + 2427^2 .

It is not an unprimeable number, because it can be changed into a prime (18133331) 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, 24135 + ... + 24874.

Almost surely, 2^18133330 is an apocalyptic number.

18133330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18133330 is a deficient number, since it is larger than the sum of its proper divisors (15389510).

18133330 is a wasteful number, since it uses less digits than its factorization.

18133330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49053.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 18133330 is about 4258.3247879888. The cubic root of 18133330 is about 262.7196287368.

The spelling of 18133330 in words is "eighteen million, one hundred thirty-three thousand, three hundred thirty".