129985839 has 12 divisors (see below), whose sum is σ = 191300616. Its totient is φ = 85021872.

The previous prime is 129985837. The next prime is 129985873. The reversal of 129985839 is 938589921.

It is not a de Polignac number, because 129985839 - 2¹ = 129985837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129985831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 135777 + ... + 136730.

It is an arithmetic number, because the mean of its divisors is an integer number (15941718).

Almost surely, 2^129985839 is an apocalyptic number.

129985839 is a deficient number, since it is larger than the sum of its proper divisors (61314777).

129985839 is a wasteful number, since it uses less digits than its factorization.

129985839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272566 (or 272563 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 54.

The square root of 129985839 is about 11401.1332331484. The cubic root of 129985839 is about 506.5613072033.

The spelling of 129985839 in words is "one hundred twenty-nine million, nine hundred eighty-five thousand, eight hundred thirty-nine".