129915 has 12 divisors (see below), whose sum is σ = 225264. Its totient is φ = 69264.

The previous prime is 129901. The next prime is 129917. The reversal of 129915 is 519921.

It is a happy number.

129915 is nontrivially palindromic in base 8.

It is not a de Polignac number, because 129915 - 2⁹ = 129403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129917) 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, 1399 + ... + 1488.

It is an arithmetic number, because the mean of its divisors is an integer number (18772).

2¹²⁹⁹¹⁵ is an apocalyptic number.

129915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129915 is a deficient number, since it is larger than the sum of its proper divisors (95349).

129915 is a wasteful number, since it uses less digits than its factorization.

129915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2898 (or 2895 counting only the distinct ones).

The product of its digits is 810, while the sum is 27.

The square root of 129915 is about 360.4372344806. The cubic root of 129915 is about 50.6469269441.

It can be divided in two parts, 12991 and 5, that added together give a square (12996 = 114²).

The spelling of 129915 in words is "one hundred twenty-nine thousand, nine hundred fifteen".