16689418 has 16 divisors (see below), whose sum is σ = 26167680. Its totient is φ = 7975296.

The previous prime is 16689401. The next prime is 16689437. The reversal of 16689418 is 81498661.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1978 + ... + 6106.

It is an arithmetic number, because the mean of its divisors is an integer number (1635480).

Almost surely, 2^16689418 is an apocalyptic number.

16689418 is a deficient number, since it is larger than the sum of its proper divisors (9478262).

16689418 is a wasteful number, since it uses less digits than its factorization.

16689418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4221.

The product of its digits is 82944, while the sum is 43.

The square root of 16689418 is about 4085.2684122344. The cubic root of 16689418 is about 255.5526550255.

It can be divided in two parts, 1668941 and 8, that multiplied together give a triangular number (13351528 = T₅₁₆₇).

The spelling of 16689418 in words is "sixteen million, six hundred eighty-nine thousand, four hundred eighteen".