18468918 has 32 divisors (see below), whose sum is σ = 44200800. Its totient is φ = 5682528.

The previous prime is 18468917. The next prime is 18468941. The reversal of 18468918 is 81986481.

It is a super-2 number, since 2×18468918² = 682201864181448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18468917) by changing a digit.

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, 12453 + ... + 13856.

It is an arithmetic number, because the mean of its divisors is an integer number (1381275).

Almost surely, 2^18468918 is an apocalyptic number.

18468918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18468918 is an abundant number, since it is smaller than the sum of its proper divisors (25731882).

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

18468918 is a wasteful number, since it uses less digits than its factorization.

18468918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26333 (or 26327 counting only the distinct ones).

The product of its digits is 110592, while the sum is 45.

The square root of 18468918 is about 4297.5479054922. The cubic root of 18468918 is about 264.3304230460.

The spelling of 18468918 in words is "eighteen million, four hundred sixty-eight thousand, nine hundred eighteen".