16816985 has 8 divisors (see below), whose sum is σ = 20220936. Its totient is φ = 13426560.

The previous prime is 16816951. The next prime is 16816991. The reversal of 16816985 is 58961861.

It can be written as a sum of positive squares in 4 ways, for example, as 2468041 + 14348944 = 1571^2 + 3788^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16816985 - 2¹⁰ = 16815961 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404 + ... + 5813.

It is an arithmetic number, because the mean of its divisors is an integer number (2527617).

Almost surely, 2^16816985 is an apocalyptic number.

It is an amenable number.

16816985 is a deficient number, since it is larger than the sum of its proper divisors (3403951).

16816985 is an equidigital number, since it uses as much as digits as its factorization.

16816985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6763.

The product of its digits is 103680, while the sum is 44.

The square root of 16816985 is about 4100.8517407973. The cubic root of 16816985 is about 256.2021159784.

The spelling of 16816985 in words is "sixteen million, eight hundred sixteen thousand, nine hundred eighty-five".