16939639 has 8 divisors (see below), whose sum is σ = 17351568. Its totient is φ = 16532160.

The previous prime is 16939631. The next prime is 16939669. The reversal of 16939639 is 93693961.

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 16939639 - 2³ = 16939631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16939631) 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 7 ways as a sum of consecutive naturals, for example, 7344 + ... + 9370.

It is an arithmetic number, because the mean of its divisors is an integer number (2168946).

Almost surely, 2^16939639 is an apocalyptic number.

16939639 is a deficient number, since it is larger than the sum of its proper divisors (411929).

16939639 is a wasteful number, since it uses less digits than its factorization.

16939639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2225.

The product of its digits is 236196, while the sum is 46.

The square root of 16939639 is about 4115.7792700775. The cubic root of 16939639 is about 256.8234743910.

It can be divided in two parts, 16939 and 639, that added together give a triangular number (17578 = T₁₈₇).

The spelling of 16939639 in words is "sixteen million, nine hundred thirty-nine thousand, six hundred thirty-nine".