16990985 has 8 divisors (see below), whose sum is σ = 22242816. Its totient is φ = 12357040.

The previous prime is 16990913. The next prime is 16990993. The reversal of 16990985 is 58909961.

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

It is not a de Polignac number, because 16990985 - 2¹² = 16986889 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, 154409 + ... + 154518.

It is an arithmetic number, because the mean of its divisors is an integer number (2780352).

Almost surely, 2^16990985 is an apocalyptic number.

It is an amenable number.

16990985 is a deficient number, since it is larger than the sum of its proper divisors (5251831).

16990985 is a wasteful number, since it uses less digits than its factorization.

16990985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308943.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 16990985 is about 4122.0122513161. The cubic root of 16990985 is about 257.0826998459.

The spelling of 16990985 in words is "sixteen million, nine hundred ninety thousand, nine hundred eighty-five".