18006858 has 12 divisors (see below), whose sum is σ = 39014898. Its totient is φ = 6002280.

The previous prime is 18006839. The next prime is 18006881. The reversal of 18006858 is 85860081.

It can be written as a sum of positive squares in only one way, i.e., 16426809 + 1580049 = 4053^2 + 1257^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 500173 + ... + 500208.

Almost surely, 2^18006858 is an apocalyptic number.

18006858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18006858 is an abundant number, since it is smaller than the sum of its proper divisors (21008040).

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

18006858 is a wasteful number, since it uses less digits than its factorization.

18006858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000389 (or 1000386 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 18006858 is about 4243.4488332016. The cubic root of 18006858 is about 262.1074186105.

The spelling of 18006858 in words is "eighteen million, six thousand, eight hundred fifty-eight".