129242980 has 24 divisors (see below), whose sum is σ = 283211712. Its totient is φ = 49449312.

The previous prime is 129242977. The next prime is 129242983. The reversal of 129242980 is 89242921.

It is an interprime number because it is at equal distance from previous prime (129242977) and next prime (129242983).

It is not an unprimeable number, because it can be changed into a prime (129242983) 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, 140022 + ... + 140941.

It is an arithmetic number, because the mean of its divisors is an integer number (11800488).

Almost surely, 2^129242980 is an apocalyptic number.

129242980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129242980 is an abundant number, since it is smaller than the sum of its proper divisors (153968732).

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

129242980 is a wasteful number, since it uses less digits than its factorization.

129242980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280995 (or 280993 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 129242980 is about 11368.5082574628. The cubic root of 129242980 is about 505.5944768614.

The spelling of 129242980 in words is "one hundred twenty-nine million, two hundred forty-two thousand, nine hundred eighty".