129831330 has 16 divisors (see below), whose sum is σ = 311595264. Its totient is φ = 34621680.

The previous prime is 129831323. The next prime is 129831337. The reversal of 129831330 is 33138921.

It is an interprime number because it is at equal distance from previous prime (129831323) and next prime (129831337).

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 4327711 = 129831330 / (1 + 2 + 9 + 8 + 3 + 1 + 3 + 3 + 0).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129831337) 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, 2163826 + ... + 2163885.

It is an arithmetic number, because the mean of its divisors is an integer number (19474704).

Almost surely, 2^129831330 is an apocalyptic number.

129831330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129831330 is an abundant number, since it is smaller than the sum of its proper divisors (181763934).

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

129831330 is a wasteful number, since it uses less digits than its factorization.

129831330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4327721.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 129831330 is about 11394.3551814045. The cubic root of 129831330 is about 506.3605178620.

The spelling of 129831330 in words is "one hundred twenty-nine million, eight hundred thirty-one thousand, three hundred thirty".