129979839 has 8 divisors (see below), whose sum is σ = 189061632. Its totient is φ = 78775640.

The previous prime is 129979819. The next prime is 129979867. The reversal of 129979839 is 938979921.

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 129979839 - 2¹⁶ = 129914303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129979819) 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, 1969359 + ... + 1969424.

It is an arithmetic number, because the mean of its divisors is an integer number (23632704).

Almost surely, 2^129979839 is an apocalyptic number.

129979839 is a deficient number, since it is larger than the sum of its proper divisors (59081793).

129979839 is a wasteful number, since it uses less digits than its factorization.

129979839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3938797.

The product of its digits is 2204496, while the sum is 57.

The square root of 129979839 is about 11400.8700983741. The cubic root of 129979839 is about 506.5535129835.

The spelling of 129979839 in words is "one hundred twenty-nine million, nine hundred seventy-nine thousand, eight hundred thirty-nine".