16990789 has 2 divisors, whose sum is σ = 16990790. Its totient is φ = 16990788.

The previous prime is 16990783. The next prime is 16990801. The reversal of 16990789 is 98709961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16402500 + 588289 = 4050^2 + 767^2 .

It is a cyclic number.

It is not a de Polignac number, because 16990789 - 2¹³ = 16982597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16990783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8495394 + 8495395.

It is an arithmetic number, because the mean of its divisors is an integer number (8495395).

Almost surely, 2^16990789 is an apocalyptic number.

It is an amenable number.

16990789 is a deficient number, since it is larger than the sum of its proper divisors (1).

16990789 is an equidigital number, since it uses as much as digits as its factorization.

16990789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 16990789 is about 4121.9884764516. The cubic root of 16990789 is about 257.0817113138.

The spelling of 16990789 in words is "sixteen million, nine hundred ninety thousand, seven hundred eighty-nine".