16990885 has 4 divisors (see below), whose sum is σ = 20389068. Its totient is φ = 13592704.

The previous prime is 16990873. The next prime is 16990889. The reversal of 16990885 is 58809961.

It is a Cunningham number, because it is equal to 4122²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6120676 + 10870209 = 2474^2 + 3297^2 .

It is a cyclic number.

It is not a de Polignac number, because 16990885 - 2⁹ = 16990373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16990889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1699084 + ... + 1699093.

It is an arithmetic number, because the mean of its divisors is an integer number (5097267).

Almost surely, 2^16990885 is an apocalyptic number.

It is an amenable number.

16990885 is a deficient number, since it is larger than the sum of its proper divisors (3398183).

16990885 is an equidigital number, since it uses as much as digits as its factorization.

16990885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3398182.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 16990885 is about 4122.0001213003. Note that the first 3 decimals coincide. The cubic root of 16990885 is about 257.0821954937.

The spelling of 16990885 in words is "sixteen million, nine hundred ninety thousand, eight hundred eighty-five".