129780792 has 160 divisors (see below), whose sum is σ = 390297600. Its totient is φ = 40170816.

The previous prime is 129780689. The next prime is 129780799. The reversal of 129780792 is 297087921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129780799) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1021833 + ... + 1021959.

It is an arithmetic number, because the mean of its divisors is an integer number (2439360).

Almost surely, 2^129780792 is an apocalyptic number.

129780792 is a gapful number since it is divisible by the number (12) 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 129780792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195148800).

129780792 is an abundant number, since it is smaller than the sum of its proper divisors (260516808).

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

129780792 is a wasteful number, since it uses less digits than its factorization.

129780792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 234 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 129780792 is about 11392.1372884986. The cubic root of 129780792 is about 506.2948075567.

The spelling of 129780792 in words is "one hundred twenty-nine million, seven hundred eighty thousand, seven hundred ninety-two".