129295980 has 96 divisors (see below), whose sum is σ = 438842880. Its totient is φ = 31343040.

The previous prime is 129295979. The next prime is 129295981. The reversal of 129295980 is 89592921.

It is an interprime number because it is at equal distance from previous prime (129295979) and next prime (129295981).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (129295981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4944 + ... + 16823.

It is an arithmetic number, because the mean of its divisors is an integer number (4571280).

Almost surely, 2^129295980 is an apocalyptic number.

129295980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129295980 is an abundant number, since it is smaller than the sum of its proper divisors (309546900).

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

129295980 is a wasteful number, since it uses less digits than its factorization.

129295980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21796 (or 21788 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 129295980 is about 11370.8390191753. The cubic root of 129295980 is about 505.6635788614.

The spelling of 129295980 in words is "one hundred twenty-nine million, two hundred ninety-five thousand, nine hundred eighty".