129969 has 12 divisors (see below), whose sum is σ = 214656. Its totient is φ = 74232.

The previous prime is 129967. The next prime is 129971. The reversal of 129969 is 969921.

It is an interprime number because it is at equal distance from previous prime (129967) and next prime (129971).

It is not a de Polignac number, because 129969 - 2¹ = 129967 is a prime.

It is a super-2 number, since 2×129969² = 33783881922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129967) 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, 969 + ... + 1094.

It is an arithmetic number, because the mean of its divisors is an integer number (17888).

2¹²⁹⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

129969 is a deficient number, since it is larger than the sum of its proper divisors (84687).

129969 is a wasteful number, since it uses less digits than its factorization.

129969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2076 (or 2073 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 129969 is about 360.5121357181. The cubic root of 129969 is about 50.6539432117.

It can be divided in two parts, 12996 and 9, that multiplied together give a square (116964 = 342²).

The spelling of 129969 in words is "one hundred twenty-nine thousand, nine hundred sixty-nine".