18416985 has 16 divisors (see below), whose sum is σ = 31018560. Its totient is φ = 9305280.

The previous prime is 18416977. The next prime is 18416989. The reversal of 18416985 is 58961481.

It is not a de Polignac number, because 18416985 - 2³ = 18416977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18416989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32026 + ... + 32595.

It is an arithmetic number, because the mean of its divisors is an integer number (1938660).

Almost surely, 2^18416985 is an apocalyptic number.

18416985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18416985 is a deficient number, since it is larger than the sum of its proper divisors (12601575).

18416985 is a wasteful number, since it uses less digits than its factorization.

18416985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64648.

The product of its digits is 69120, while the sum is 42.

The square root of 18416985 is about 4291.5014854943. The cubic root of 18416985 is about 264.0824323621.

The spelling of 18416985 in words is "eighteen million, four hundred sixteen thousand, nine hundred eighty-five".