129907830 has 32 divisors (see below), whose sum is σ = 335762784. Its totient is φ = 31977216.

The previous prime is 129907819. The next prime is 129907861. The reversal of 129907830 is 38709921.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166159 + ... + 166938.

It is an arithmetic number, because the mean of its divisors is an integer number (10492587).

Almost surely, 2^129907830 is an apocalyptic number.

129907830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129907830 is an abundant number, since it is smaller than the sum of its proper divisors (205854954).

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

129907830 is a wasteful number, since it uses less digits than its factorization.

129907830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333120.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 129907830 is about 11397.7116124247. The cubic root of 129907830 is about 506.4599519352.

The spelling of 129907830 in words is "one hundred twenty-nine million, nine hundred seven thousand, eight hundred thirty".