16689507 has 8 divisors (see below), whose sum is σ = 22630080. Its totient is φ = 10937640.

The previous prime is 16689503. The next prime is 16689509. The reversal of 16689507 is 70598661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16689507 - 2² = 16689503 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (16689503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46969 + ... + 47322.

It is an arithmetic number, because the mean of its divisors is an integer number (2828760).

Almost surely, 2^16689507 is an apocalyptic number.

16689507 is a deficient number, since it is larger than the sum of its proper divisors (5940573).

16689507 is an equidigital number, since it uses as much as digits as its factorization.

16689507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94353.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 16689507 is about 4085.2793050170. The cubic root of 16689507 is about 255.5531092884.

It can be divided in two parts, 1668 and 9507, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 16689507 in words is "sixteen million, six hundred eighty-nine thousand, five hundred seven".