129725706 has 16 divisors (see below), whose sum is σ = 283038048. Its totient is φ = 39310800.

The previous prime is 129725693. The next prime is 129725707. The reversal of 129725706 is 607527921.

It is not an unprimeable number, because it can be changed into a prime (129725707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 982705 + ... + 982836.

It is an arithmetic number, because the mean of its divisors is an integer number (17689878).

Almost surely, 2^129725706 is an apocalyptic number.

129725706 is an abundant number, since it is smaller than the sum of its proper divisors (153312342).

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

129725706 is a wasteful number, since it uses less digits than its factorization.

129725706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1965557.

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 129725706 is about 11389.7193117302. The cubic root of 129725706 is about 506.2231644364.

The spelling of 129725706 in words is "one hundred twenty-nine million, seven hundred twenty-five thousand, seven hundred six".