18533994 has 32 divisors (see below), whose sum is σ = 38102400. Its totient is φ = 6007872.

The previous prime is 18533993. The next prime is 18534017. The reversal of 18533994 is 49933581.

It is not an unprimeable number, because it can be changed into a prime (18533993) 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 15 ways as a sum of consecutive naturals, for example, 52932 + ... + 53280.

It is an arithmetic number, because the mean of its divisors is an integer number (1190700).

Almost surely, 2^18533994 is an apocalyptic number.

18533994 is an abundant number, since it is smaller than the sum of its proper divisors (19568406).

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

18533994 is a wasteful number, since it uses less digits than its factorization.

18533994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574.

The product of its digits is 116640, while the sum is 42.

The square root of 18533994 is about 4305.1125420830. The cubic root of 18533994 is about 264.6405188619.

The spelling of 18533994 in words is "eighteen million, five hundred thirty-three thousand, nine hundred ninety-four".