18081858 has 8 divisors (see below), whose sum is σ = 36163728. Its totient is φ = 6027284.

The previous prime is 18081853. The next prime is 18081859. The reversal of 18081858 is 85818081.

It is a sphenic number, since it is the product of 3 distinct primes.

18081858 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (18081853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1506816 + ... + 1506827.

It is an arithmetic number, because the mean of its divisors is an integer number (4520466).

Almost surely, 2^18081858 is an apocalyptic number.

18081858 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18081858 is a wasteful number, since it uses less digits than its factorization.

18081858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3013648.

The product of its (nonzero) digits is 20480, while the sum is 39.

The square root of 18081858 is about 4252.2768019027. The cubic root of 18081858 is about 262.4708139886.

The spelling of 18081858 in words is "eighteen million, eighty-one thousand, eight hundred fifty-eight".