16987689 has 6 divisors (see below), whose sum is σ = 24537786. Its totient is φ = 11325120.

The previous prime is 16987679. The next prime is 16987703. The reversal of 16987689 is 98678961.

It can be written as a sum of positive squares in only one way, i.e., 14402025 + 2585664 = 3795^2 + 1608^2 .

It is not a de Polignac number, because 16987689 - 2⁵ = 16987657 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16987669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 943752 + ... + 943769.

It is an arithmetic number, because the mean of its divisors is an integer number (4089631).

Almost surely, 2^16987689 is an apocalyptic number.

It is an amenable number.

16987689 is a deficient number, since it is larger than the sum of its proper divisors (7550097).

16987689 is a wasteful number, since it uses less digits than its factorization.

16987689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1887527 (or 1887524 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 16987689 is about 4121.6124271940. The cubic root of 16987689 is about 257.0660753560.

The spelling of 16987689 in words is "sixteen million, nine hundred eighty-seven thousand, six hundred eighty-nine".