16990785 has 24 divisors (see below), whose sum is σ = 33658560. Its totient is φ = 7767072.

The previous prime is 16990783. The next prime is 16990789. The reversal of 16990785 is 58709961.

16990785 = T₃₂₆ + T₃₂₇ + ... + T₅₁₄.

It is not a de Polignac number, because 16990785 - 2¹ = 16990783 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 16990785.

It is not an unprimeable number, because it can be changed into a prime (16990783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26655 + ... + 27284.

It is an arithmetic number, because the mean of its divisors is an integer number (1402440).

Almost surely, 2^16990785 is an apocalyptic number.

16990785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16990785 is a deficient number, since it is larger than the sum of its proper divisors (16667775).

16990785 is a wasteful number, since it uses less digits than its factorization.

16990785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53957 (or 53954 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 16990785 is about 4121.9879912489. The cubic root of 16990785 is about 257.0816911396.

The spelling of 16990785 in words is "sixteen million, nine hundred ninety thousand, seven hundred eighty-five".