18416885 has 16 divisors (see below), whose sum is σ = 23036400. Its totient is φ = 14117376.

The previous prime is 18416873. The next prime is 18416887. The reversal of 18416885 is 58861481.

It can be written as a sum of positive squares in 8 ways, for example, as 47089 + 18369796 = 217^2 + 4286^2 .

It is a cyclic number.

It is not a de Polignac number, because 18416885 - 2²² = 14222581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18416887) 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, 22361 + ... + 23169.

It is an arithmetic number, because the mean of its divisors is an integer number (1439775).

Almost surely, 2^18416885 is an apocalyptic number.

It is an amenable number.

18416885 is a deficient number, since it is larger than the sum of its proper divisors (4619515).

18416885 is a wasteful number, since it uses less digits than its factorization.

18416885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000.

The product of its digits is 61440, while the sum is 41.

The square root of 18416885 is about 4291.4898345446. The cubic root of 18416885 is about 264.0819543922.

The spelling of 18416885 in words is "eighteen million, four hundred sixteen thousand, eight hundred eighty-five".