16139669 has 18 divisors (see below), whose sum is σ = 20340450. Its totient is φ = 12763296.

The previous prime is 16139611. The next prime is 16139671. The reversal of 16139669 is 96693161.

It can be written as a sum of positive squares in 3 ways, for example, as 442225 + 15697444 = 665^2 + 3962^2 .

It is not a de Polignac number, because 16139669 - 2⁸ = 16139413 is a prime.

It is a super-2 number, since 2×16139669² = 520977830859122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16139269) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 7307 + ... + 9255.

It is an arithmetic number, because the mean of its divisors is an integer number (1130025).

Almost surely, 2^16139669 is an apocalyptic number.

It is an amenable number.

16139669 is a deficient number, since it is larger than the sum of its proper divisors (4200781).

16139669 is a wasteful number, since it uses less digits than its factorization.

16139669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1989 (or 1969 counting only the distinct ones).

The product of its digits is 52488, while the sum is 41.

The square root of 16139669 is about 4017.4206899452. The cubic root of 16139669 is about 252.7153030790.

The spelling of 16139669 in words is "sixteen million, one hundred thirty-nine thousand, six hundred sixty-nine".