13939839 has 6 divisors (see below), whose sum is σ = 20135336. Its totient is φ = 9293220.

The previous prime is 13939837. The next prime is 13939859. The reversal of 13939839 is 93893931.

It is not a de Polignac number, because 13939839 - 2¹ = 13939837 is a prime.

It is a super-2 number, since 2×13939839² = 388638222691842, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13939794 and 13939803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13939831) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 774427 + ... + 774444.

Almost surely, 2^13939839 is an apocalyptic number.

13939839 is a deficient number, since it is larger than the sum of its proper divisors (6195497).

13939839 is a wasteful number, since it uses less digits than its factorization.

13939839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548877 (or 1548874 counting only the distinct ones).

The product of its digits is 157464, while the sum is 45.

The square root of 13939839 is about 3733.6093796754. The cubic root of 13939839 is about 240.6685007990.

The spelling of 13939839 in words is "thirteen million, nine hundred thirty-nine thousand, eight hundred thirty-nine".