18481886 has 8 divisors (see below), whose sum is σ = 27845640. Its totient is φ = 9200008.

The previous prime is 18481871. The next prime is 18481891. The reversal of 18481886 is 68818481.

It is a happy number.

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

It is a super-2 number, since 2×18481886² = 683160220233992, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19901 + ... + 20808.

It is an arithmetic number, because the mean of its divisors is an integer number (3480705).

Almost surely, 2^18481886 is an apocalyptic number.

18481886 is a deficient number, since it is larger than the sum of its proper divisors (9363754).

18481886 is a wasteful number, since it uses less digits than its factorization.

18481886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40938.

The product of its digits is 98304, while the sum is 44.

The square root of 18481886 is about 4299.0564080970. The cubic root of 18481886 is about 264.3922753421.

The spelling of 18481886 in words is "eighteen million, four hundred eighty-one thousand, eight hundred eighty-six".