129028239 has 12 divisors (see below), whose sum is σ = 186476472. Its totient is φ = 85971600.

The previous prime is 129028199. The next prime is 129028247. The reversal of 129028239 is 932820921.

It is not a de Polignac number, because 129028239 - 2⁷ = 129028111 is a prime.

It is a super-2 number, since 2×129028239² = 33296572918882242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129028439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23244 + ... + 28254.

It is an arithmetic number, because the mean of its divisors is an integer number (15539706).

Almost surely, 2^129028239 is an apocalyptic number.

129028239 is a deficient number, since it is larger than the sum of its proper divisors (57448233).

129028239 is a wasteful number, since it uses less digits than its factorization.

129028239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7878 (or 7875 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 129028239 is about 11359.0597762315. The cubic root of 129028239 is about 505.3143016161.

The spelling of 129028239 in words is "one hundred twenty-nine million, twenty-eight thousand, two hundred thirty-nine".