18493866 has 32 divisors (see below), whose sum is σ = 41328000. Its totient is φ = 6130080.

The previous prime is 18493823. The next prime is 18493877. The reversal of 18493866 is 66839481.

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 15 ways as a sum of consecutive naturals, for example, 9886 + ... + 11606.

It is an arithmetic number, because the mean of its divisors is an integer number (1291500).

Almost surely, 2^18493866 is an apocalyptic number.

18493866 is an abundant number, since it is smaller than the sum of its proper divisors (22834134).

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

18493866 is a wasteful number, since it uses less digits than its factorization.

18493866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1931 (or 1925 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 18493866 is about 4300.4495113883. The cubic root of 18493866 is about 264.4493895588.

The spelling of 18493866 in words is "eighteen million, four hundred ninety-three thousand, eight hundred sixty-six".