129780942 has 32 divisors (see below), whose sum is σ = 270480384. Its totient is φ = 41467200.

The previous prime is 129780929. The next prime is 129780953. The reversal of 129780942 is 249087921.

129780942 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 129780894 and 129780903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16642 + ... + 23162.

It is an arithmetic number, because the mean of its divisors is an integer number (8452512).

Almost surely, 2^129780942 is an apocalyptic number.

129780942 is an abundant number, since it is smaller than the sum of its proper divisors (140699442).

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

129780942 is a wasteful number, since it uses less digits than its factorization.

129780942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6664.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 129780942 is about 11392.1438719848. The cubic root of 129780942 is about 506.2950026143.

The spelling of 129780942 in words is "one hundred twenty-nine million, seven hundred eighty thousand, nine hundred forty-two".