16985690 has 8 divisors (see below), whose sum is σ = 30574260. Its totient is φ = 6794272.

The previous prime is 16985663. The next prime is 16985699. The reversal of 16985690 is 9658961.

It can be written as a sum of positive squares in 2 ways, for example, as 14891881 + 2093809 = 3859^2 + 1447^2 .

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

It is a super-2 number, since 2×16985690² = 577027329552200, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (16985699) 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 3 ways as a sum of consecutive naturals, for example, 849275 + ... + 849294.

Almost surely, 2^16985690 is an apocalyptic number.

16985690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16985690 is a deficient number, since it is larger than the sum of its proper divisors (13588570).

16985690 is a wasteful number, since it uses less digits than its factorization.

16985690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1698576.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 16985690 is about 4121.3699178792. The cubic root of 16985690 is about 257.0559916763.

The spelling of 16985690 in words is "sixteen million, nine hundred eighty-five thousand, six hundred ninety".