16985985 has 16 divisors (see below), whose sum is σ = 28055040. Its totient is φ = 8766720.

The previous prime is 16985971. The next prime is 16985993. The reversal of 16985985 is 58958961.

It is not a de Polignac number, because 16985985 - 2⁵ = 16985953 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17800 + ... + 18729.

It is an arithmetic number, because the mean of its divisors is an integer number (1753440).

Almost surely, 2^16985985 is an apocalyptic number.

16985985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16985985 is a deficient number, since it is larger than the sum of its proper divisors (11069055).

16985985 is a wasteful number, since it uses less digits than its factorization.

16985985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36568.

The product of its digits is 777600, while the sum is 51.

The square root of 16985985 is about 4121.4057067947. The cubic root of 16985985 is about 257.0574798129.

The spelling of 16985985 in words is "sixteen million, nine hundred eighty-five thousand, nine hundred eighty-five".