129252839 has 8 divisors (see below), whose sum is σ = 138287280. Its totient is φ = 120441600.

The previous prime is 129252817. The next prime is 129252859. The reversal of 129252839 is 938252921.

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-129252839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129252796 and 129252805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129252859) 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, 54602 + ... + 56919.

It is an arithmetic number, because the mean of its divisors is an integer number (17285910).

Almost surely, 2^129252839 is an apocalyptic number.

129252839 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

129252839 is a deficient number, since it is larger than the sum of its proper divisors (9034441).

129252839 is a wasteful number, since it uses less digits than its factorization.

129252839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111601.

The product of its digits is 77760, while the sum is 41.

The square root of 129252839 is about 11368.9418592937. The cubic root of 129252839 is about 505.6073325673.

The spelling of 129252839 in words is "one hundred twenty-nine million, two hundred fifty-two thousand, eight hundred thirty-nine".