18558012 has 36 divisors (see below), whose sum is σ = 47600168. Its totient is φ = 5623200.

The previous prime is 18557993. The next prime is 18558017. The reversal of 18558012 is 21085581.

It is a super-4 number, since 4×18558012⁴ (a number of 30 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18558017) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4939 + ... + 7842.

Almost surely, 2^18558012 is an apocalyptic number.

18558012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18558012 is an abundant number, since it is smaller than the sum of its proper divisors (29042156).

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

18558012 is a wasteful number, since it uses less digits than its factorization.

18558012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12810 (or 12797 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 18558012 is about 4307.9011130712. The cubic root of 18558012 is about 264.7547844351.

The spelling of 18558012 in words is "eighteen million, five hundred fifty-eight thousand, twelve".