16987859 has 12 divisors (see below), whose sum is σ = 20004264. Its totient is φ = 14382144.

The previous prime is 16987853. The next prime is 16987891. The reversal of 16987859 is 95878961.

It is not a de Polignac number, because 16987859 - 2²⁴ = 210643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16987859.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16987853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1979 + ... + 6155.

It is an arithmetic number, because the mean of its divisors is an integer number (1667022).

Almost surely, 2^16987859 is an apocalyptic number.

16987859 is a deficient number, since it is larger than the sum of its proper divisors (3016405).

16987859 is an equidigital number, since it uses as much as digits as its factorization.

16987859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4274 (or 4267 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 53.

The square root of 16987859 is about 4121.6330501392. The cubic root of 16987859 is about 257.0669328610.

The spelling of 16987859 in words is "sixteen million, nine hundred eighty-seven thousand, eight hundred fifty-nine".