129239079 has 8 divisors (see below), whose sum is σ = 172371312. Its totient is φ = 86133120.

The previous prime is 129239063. The next prime is 129239081. The reversal of 129239079 is 970932921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129239079 - 2⁴ = 129239063 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 129239079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129239009) 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, 15669 + ... + 22449.

It is an arithmetic number, because the mean of its divisors is an integer number (21546414).

Almost surely, 2^129239079 is an apocalyptic number.

129239079 is a deficient number, since it is larger than the sum of its proper divisors (43132233).

129239079 is an equidigital number, since it uses as much as digits as its factorization.

129239079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13137.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 129239079 is about 11368.3366857250. The cubic root of 129239079 is about 505.5893899471.

The spelling of 129239079 in words is "one hundred twenty-nine million, two hundred thirty-nine thousand, seventy-nine".