16689959 has 16 divisors (see below), whose sum is σ = 19783680. Its totient is φ = 13880160.

The previous prime is 16689941. The next prime is 16690001. The reversal of 16689959 is 95998661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16689959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16689959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16689919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17702 + ... + 18620.

It is an arithmetic number, because the mean of its divisors is an integer number (1236480).

Almost surely, 2^16689959 is an apocalyptic number.

16689959 is a deficient number, since it is larger than the sum of its proper divisors (3093721).

16689959 is a wasteful number, since it uses less digits than its factorization.

16689959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070.

The product of its digits is 1049760, while the sum is 53.

The square root of 16689959 is about 4085.3346252174. The cubic root of 16689959 is about 255.5554163060. Note that the first 3 decimals are identical.

The spelling of 16689959 in words is "sixteen million, six hundred eighty-nine thousand, nine hundred fifty-nine".