129975 has 12 divisors (see below), whose sum is σ = 215016. Its totient is φ = 69280.

The previous prime is 129971. The next prime is 130003. The reversal of 129975 is 579921.

It is not a de Polignac number, because 129975 - 2² = 129971 is a prime.

129975 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129971) 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, 792 + ... + 941.

It is an arithmetic number, because the mean of its divisors is an integer number (17918).

2¹²⁹⁹⁷⁵ is an apocalyptic number.

129975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129975 is a deficient number, since it is larger than the sum of its proper divisors (85041).

129975 is a wasteful number, since it uses less digits than its factorization.

129975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1746 (or 1741 counting only the distinct ones).

The product of its digits is 5670, while the sum is 33.

The square root of 129975 is about 360.5204571172. The cubic root of 129975 is about 50.6547226770.

The spelling of 129975 in words is "one hundred twenty-nine thousand, nine hundred seventy-five".