16639139 has 8 divisors (see below), whose sum is σ = 18181632. Its totient is φ = 15101640.

The previous prime is 16639123. The next prime is 16639163. The reversal of 16639139 is 93193661.

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

It is a cyclic number.

It is not a de Polignac number, because 16639139 - 2⁴ = 16639123 is a prime.

It is a super-2 number, since 2×16639139² = 553721893322642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16639199) 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, 10982 + ... + 12404.

It is an arithmetic number, because the mean of its divisors is an integer number (2272704).

Almost surely, 2^16639139 is an apocalyptic number.

16639139 is a deficient number, since it is larger than the sum of its proper divisors (1542493).

16639139 is a wasteful number, since it uses less digits than its factorization.

16639139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2497.

The product of its digits is 26244, while the sum is 38.

The square root of 16639139 is about 4079.1100745138. The cubic root of 16639139 is about 255.2957685642.

The spelling of 16639139 in words is "sixteen million, six hundred thirty-nine thousand, one hundred thirty-nine".