129397830 has 64 divisors (see below), whose sum is σ = 317253888. Its totient is φ = 33770880.

The previous prime is 129397823. The next prime is 129397831. The reversal of 129397830 is 38793921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129397831) 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, 390765 + ... + 391095.

It is an arithmetic number, because the mean of its divisors is an integer number (4957092).

Almost surely, 2^129397830 is an apocalyptic number.

129397830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129397830 is an abundant number, since it is smaller than the sum of its proper divisors (187856058).

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

129397830 is a wasteful number, since it uses less digits than its factorization.

129397830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 129397830 is about 11375.3166988880. The cubic root of 129397830 is about 505.7963190499.

The spelling of 129397830 in words is "one hundred twenty-nine million, three hundred ninety-seven thousand, eight hundred thirty".