16640469 has 12 divisors (see below), whose sum is σ = 24199500. Its totient is φ = 11018304.

The previous prime is 16640453. The next prime is 16640473. The reversal of 16640469 is 96404661.

16640469 is a `hidden beast` number, since 1 + 6 + 640 + 4 + 6 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1077444 + 15563025 = 1038^2 + 3945^2 .

It is not a de Polignac number, because 16640469 - 2⁴ = 16640453 is a prime.

It is a super-2 number, since 2×16640469² = 553810417079922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16640069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4864 + ... + 7545.

It is an arithmetic number, because the mean of its divisors is an integer number (2016625).

Almost surely, 2^16640469 is an apocalyptic number.

It is an amenable number.

16640469 is a deficient number, since it is larger than the sum of its proper divisors (7559031).

16640469 is a wasteful number, since it uses less digits than its factorization.

16640469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12564 (or 12561 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 16640469 is about 4079.2730970113. The cubic root of 16640469 is about 255.3025704852.

The spelling of 16640469 in words is "sixteen million, six hundred forty thousand, four hundred sixty-nine".