129020830 has 32 divisors (see below), whose sum is σ = 245066400. Its totient is φ = 48771072.

The previous prime is 129020807. The next prime is 129020833. The reversal of 129020830 is 38020921.

It is a junction number, because it is equal to n+sod(n) for n = 129020795 and 129020804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129020833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127366 + ... + 128374.

It is an arithmetic number, because the mean of its divisors is an integer number (7658325).

Almost surely, 2^129020830 is an apocalyptic number.

129020830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129020830 is a deficient number, since it is larger than the sum of its proper divisors (116045570).

129020830 is a wasteful number, since it uses less digits than its factorization.

129020830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1708.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 129020830 is about 11358.7336442052. The cubic root of 129020830 is about 505.3046294560.

Subtracting from 129020830 its reverse (38020921), we obtain a palindrome (90999909).

The spelling of 129020830 in words is "one hundred twenty-nine million, twenty thousand, eight hundred thirty".