16987917 has 16 divisors (see below), whose sum is σ = 23152640. Its totient is φ = 11076912.

The previous prime is 16987909. The next prime is 16987963. The reversal of 16987917 is 71978961.

It is a happy number.

It is not a de Polignac number, because 16987917 - 2³ = 16987909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16987987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44634 + ... + 45012.

It is an arithmetic number, because the mean of its divisors is an integer number (1447040).

Almost surely, 2^16987917 is an apocalyptic number.

It is an amenable number.

16987917 is a deficient number, since it is larger than the sum of its proper divisors (6164723).

16987917 is a wasteful number, since it uses less digits than its factorization.

16987917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672.

The product of its digits is 190512, while the sum is 48.

The square root of 16987917 is about 4121.6400861793. The cubic root of 16987917 is about 257.0672254203.

The spelling of 16987917 in words is "sixteen million, nine hundred eighty-seven thousand, nine hundred seventeen".