16990489 has 2 divisors, whose sum is σ = 16990490. Its totient is φ = 16990488.

The previous prime is 16990469. The next prime is 16990507. The reversal of 16990489 is 98409961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10272025 + 6718464 = 3205^2 + 2592^2 .

It is a cyclic number.

It is not a de Polignac number, because 16990489 - 2¹⁹ = 16466201 is a prime.

It is not a weakly prime, because it can be changed into another prime (16990439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8495244 + 8495245.

It is an arithmetic number, because the mean of its divisors is an integer number (8495245).

Almost surely, 2^16990489 is an apocalyptic number.

It is an amenable number.

16990489 is a deficient number, since it is larger than the sum of its proper divisors (1).

16990489 is an equidigital number, since it uses as much as digits as its factorization.

16990489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 16990489 is about 4121.9520860874. The cubic root of 16990489 is about 257.0801982397.

The spelling of 16990489 in words is "sixteen million, nine hundred ninety thousand, four hundred eighty-nine".