129715 has 4 divisors (see below), whose sum is σ = 155664. Its totient is φ = 103768.

The previous prime is 129707. The next prime is 129719. The reversal of 129715 is 517921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 517921 = 19 ⋅27259.

It is a cyclic number.

It is not a de Polignac number, because 129715 - 2³ = 129707 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129715.

It is not an unprimeable number, because it can be changed into a prime (129719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12967 + ... + 12976.

It is an arithmetic number, because the mean of its divisors is an integer number (38916).

2¹²⁹⁷¹⁵ is an apocalyptic number.

129715 is a deficient number, since it is larger than the sum of its proper divisors (25949).

129715 is an equidigital number, since it uses as much as digits as its factorization.

129715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25948.

The product of its digits is 630, while the sum is 25.

The square root of 129715 is about 360.1596868057. The cubic root of 129715 is about 50.6209238195.

It can be divided in two parts, 129 and 715, that multiplied together give a triangular number (92235 = T₄₂₉).

The spelling of 129715 in words is "one hundred twenty-nine thousand, seven hundred fifteen".