129708889 has 4 divisors (see below), whose sum is σ = 129980160. Its totient is φ = 129437620.

The previous prime is 129708883. The next prime is 129708893. The reversal of 129708889 is 988807921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129708889 - 2³ = 129708881 is a prime.

It is a super-2 number, since 2×129708889² = 33648791771228642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129708881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134917 + ... + 135874.

It is an arithmetic number, because the mean of its divisors is an integer number (32495040).

Almost surely, 2^129708889 is an apocalyptic number.

It is an amenable number.

129708889 is a deficient number, since it is larger than the sum of its proper divisors (271271).

129708889 is an equidigital number, since it uses as much as digits as its factorization.

129708889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271270.

The product of its (nonzero) digits is 580608, while the sum is 52.

The square root of 129708889 is about 11388.9810343156. The cubic root of 129708889 is about 506.2012887339.

The spelling of 129708889 in words is "one hundred twenty-nine million, seven hundred eight thousand, eight hundred eighty-nine".