129239039 has 8 divisors (see below), whose sum is σ = 132991488. Its totient is φ = 125500320.

The previous prime is 129239021. The next prime is 129239041. The reversal of 129239039 is 930932921.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129239039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129238993 and 129239011.

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, 17474 + ... + 23744.

It is an arithmetic number, because the mean of its divisors is an integer number (16623936).

Almost surely, 2^129239039 is an apocalyptic number.

129239039 is a deficient number, since it is larger than the sum of its proper divisors (3752449).

129239039 is an equidigital number, since it uses as much as digits as its factorization.

129239039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6865.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 129239039 is about 11368.3349264525. The cubic root of 129239039 is about 505.5893377865.

The spelling of 129239039 in words is "one hundred twenty-nine million, two hundred thirty-nine thousand, thirty-nine".