129976 has 32 divisors (see below), whose sum is σ = 305280. Its totient is φ = 50400.

The previous prime is 129971. The next prime is 130003. The reversal of 129976 is 679921.

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 7 ways as a sum of consecutive naturals, for example, 511 + ... + 721.

It is an arithmetic number, because the mean of its divisors is an integer number (9540).

2¹²⁹⁹⁷⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152640).

129976 is an abundant number, since it is smaller than the sum of its proper divisors (175304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129976 is a wasteful number, since it uses less digits than its factorization.

129976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 231 counting only the distinct ones).

The product of its digits is 6804, while the sum is 34.

The square root of 129976 is about 360.5218439984. The cubic root of 129976 is about 50.6548525856.

Subtracting 129976 from its reverse (679921), we obtain a palindrome (549945).

The spelling of 129976 in words is "one hundred twenty-nine thousand, nine hundred seventy-six".