129791940 has 48 divisors (see below), whose sum is σ = 384797952. Its totient is φ = 32574976.

The previous prime is 129791911. The next prime is 129791941. The reversal of 129791940 is 49197921.

It is a junction number, because it is equal to n+sod(n) for n = 129791892 and 129791901.

It is not an unprimeable number, because it can be changed into a prime (129791941) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 62604 + ... + 64643.

It is an arithmetic number, because the mean of its divisors is an integer number (8016624).

Almost surely, 2^129791940 is an apocalyptic number.

129791940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129791940 is an abundant number, since it is smaller than the sum of its proper divisors (255006012).

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

129791940 is a wasteful number, since it uses less digits than its factorization.

129791940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127276 (or 127274 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 42.

The square root of 129791940 is about 11392.6265628256. The cubic root of 129791940 is about 506.3093038285.

The spelling of 129791940 in words is "one hundred twenty-nine million, seven hundred ninety-one thousand, nine hundred forty".