16990287 has 4 divisors (see below), whose sum is σ = 22653720. Its totient is φ = 11326856.

The previous prime is 16990283. The next prime is 16990291. The reversal of 16990287 is 78209961.

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

It is an interprime number because it is at equal distance from previous prime (16990283) and next prime (16990291).

It is a cyclic number.

It is not a de Polignac number, because 16990287 - 2² = 16990283 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16990283) 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, 2831712 + ... + 2831717.

It is an arithmetic number, because the mean of its divisors is an integer number (5663430).

Almost surely, 2^16990287 is an apocalyptic number.

16990287 is a deficient number, since it is larger than the sum of its proper divisors (5663433).

16990287 is an equidigital number, since it uses as much as digits as its factorization.

16990287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5663432.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 16990287 is about 4121.9275830611. The cubic root of 16990287 is about 257.0791794264.

The spelling of 16990287 in words is "sixteen million, nine hundred ninety thousand, two hundred eighty-seven".