16813985 has 16 divisors (see below), whose sum is σ = 20886336. Its totient is φ = 12986688.

The previous prime is 16813963. The next prime is 16813987. The reversal of 16813985 is 58931861.

It is a cyclic number.

It is not a de Polignac number, because 16813985 - 2⁸ = 16813729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16813987) 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, 17282 + ... + 18228.

It is an arithmetic number, because the mean of its divisors is an integer number (1305396).

Almost surely, 2^16813985 is an apocalyptic number.

It is an amenable number.

16813985 is a deficient number, since it is larger than the sum of its proper divisors (4072351).

16813985 is an equidigital number, since it uses as much as digits as its factorization.

16813985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072.

The product of its digits is 51840, while the sum is 41.

The square root of 16813985 is about 4100.4859468117. The cubic root of 16813985 is about 256.1868803489.

The spelling of 16813985 in words is "sixteen million, eight hundred thirteen thousand, nine hundred eighty-five".