18405868 has 24 divisors (see below), whose sum is σ = 34856640. Its totient is φ = 8453760.

The previous prime is 18405859. The next prime is 18405869. The reversal of 18405868 is 86850481.

It is a self number, because there is not a number n which added to its sum of digits gives 18405868.

It is not an unprimeable number, because it can be changed into a prime (18405869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11688 + ... + 13168.

It is an arithmetic number, because the mean of its divisors is an integer number (1452360).

Almost surely, 2^18405868 is an apocalyptic number.

It is an amenable number.

18405868 is a deficient number, since it is larger than the sum of its proper divisors (16450772).

18405868 is a wasteful number, since it uses less digits than its factorization.

18405868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737 (or 1735 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 18405868 is about 4290.2060556575. The cubic root of 18405868 is about 264.0292858543.

The spelling of 18405868 in words is "eighteen million, four hundred five thousand, eight hundred sixty-eight".