16688469 has 24 divisors (see below), whose sum is σ = 26150688. Its totient is φ = 9438240.

The previous prime is 16688453. The next prime is 16688471. The reversal of 16688469 is 96488661.

It is not a de Polignac number, because 16688469 - 2⁴ = 16688453 is a prime.

It is a super-2 number, since 2×16688469² = 557009995127922, which contains 22 as substring.

It is a nialpdrome in base 4 and base 16.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16688449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15199 + ... + 16259.

It is an arithmetic number, because the mean of its divisors is an integer number (1089612).

Almost surely, 2^16688469 is an apocalyptic number.

It is an amenable number.

16688469 is a deficient number, since it is larger than the sum of its proper divisors (9462219).

16688469 is a wasteful number, since it uses less digits than its factorization.

16688469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185 (or 1178 counting only the distinct ones).

The product of its digits is 497664, while the sum is 48.

The square root of 16688469 is about 4085.1522615442. The cubic root of 16688469 is about 255.5478111565.

The spelling of 16688469 in words is "sixteen million, six hundred eighty-eight thousand, four hundred sixty-nine".