129289439 has 8 divisors (see below), whose sum is σ = 132001968. Its totient is φ = 126596160.

The previous prime is 129289421. The next prime is 129289483. The reversal of 129289439 is 934982921.

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 129289439 - 2²⁴ = 112512223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129289393 and 129289402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129289409) 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, 9179 + ... + 18515.

It is an arithmetic number, because the mean of its divisors is an integer number (16500246).

Almost surely, 2^129289439 is an apocalyptic number.

129289439 is a deficient number, since it is larger than the sum of its proper divisors (2712529).

129289439 is an equidigital number, since it uses as much as digits as its factorization.

129289439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9625.

The product of its digits is 279936, while the sum is 47.

The square root of 129289439 is about 11370.5513938419. The cubic root of 129289439 is about 505.6550516531.

The spelling of 129289439 in words is "one hundred twenty-nine million, two hundred eighty-nine thousand, four hundred thirty-nine".