129791340 has 144 divisors (see below), whose sum is σ = 452874240. Its totient is φ = 29473920.

The previous prime is 129791339. The next prime is 129791351. The reversal of 129791340 is 43197921.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 129791295 and 129791304.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 300925 + ... + 301355.

It is an arithmetic number, because the mean of its divisors is an integer number (3144960).

Almost surely, 2^129791340 is an apocalyptic number.

129791340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129791340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226437120).

129791340 is an abundant number, since it is smaller than the sum of its proper divisors (323082900).

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

129791340 is a wasteful number, since it uses less digits than its factorization.

129791340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692 (or 687 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 129791340 is about 11392.6002299738. The cubic root of 129791340 is about 506.3085236412.

The spelling of 129791340 in words is "one hundred twenty-nine million, seven hundred ninety-one thousand, three hundred forty".