129506839 has 8 divisors (see below), whose sum is σ = 161463168. Its totient is φ = 100914360.

The previous prime is 129506827. The next prime is 129506851. The reversal of 129506839 is 938605921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (129506827) and next prime (129506851).

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 129506839 - 2⁵ = 129506807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129506795 and 129506804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129506339) 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, 840877 + ... + 841030.

It is an arithmetic number, because the mean of its divisors is an integer number (20182896).

Almost surely, 2^129506839 is an apocalyptic number.

129506839 is a deficient number, since it is larger than the sum of its proper divisors (31956329).

129506839 is a wasteful number, since it uses less digits than its factorization.

129506839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1681925.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 129506839 is about 11380.1071611826. The cubic root of 129506839 is about 505.9383123515.

The spelling of 129506839 in words is "one hundred twenty-nine million, five hundred six thousand, eight hundred thirty-nine".