18105858 has 24 divisors (see below), whose sum is σ = 39312000. Its totient is φ = 6022584.

The previous prime is 18105851. The next prime is 18105863. The reversal of 18105858 is 85850181.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18105851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12243 + ... + 13641.

It is an arithmetic number, because the mean of its divisors is an integer number (1638000).

Almost surely, 2^18105858 is an apocalyptic number.

18105858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18105858 is an abundant number, since it is smaller than the sum of its proper divisors (21206142).

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

18105858 is a wasteful number, since it uses less digits than its factorization.

18105858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2126 (or 2123 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 36.

The square root of 18105858 is about 4255.0978837155. The cubic root of 18105858 is about 262.5868882434.

The spelling of 18105858 in words is "eighteen million, one hundred five thousand, eight hundred fifty-eight".