16990825 has 6 divisors (see below), whose sum is σ = 21068654. Its totient is φ = 13592640.

The previous prime is 16990817. The next prime is 16990843. The reversal of 16990825 is 52809961.

It can be written as a sum of positive squares in 3 ways, for example, as 5184729 + 11806096 = 2277^2 + 3436^2 .

It is not a de Polignac number, because 16990825 - 2³ = 16990817 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 339792 + ... + 339841.

Almost surely, 2^16990825 is an apocalyptic number.

It is an amenable number.

16990825 is a deficient number, since it is larger than the sum of its proper divisors (4077829).

16990825 is an equidigital number, since it uses as much as digits as its factorization.

16990825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679643 (or 679638 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 16990825 is about 4121.9928432737. The cubic root of 16990825 is about 257.0818928815.

The spelling of 16990825 in words is "sixteen million, nine hundred ninety thousand, eight hundred twenty-five".