129839722 has 16 divisors (see below), whose sum is σ = 197588160. Its totient is φ = 63980992.

The previous prime is 129839719. The next prime is 129839729. The reversal of 129839722 is 227938921.

It is not an unprimeable number, because it can be changed into a prime (129839729) 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, 97779 + ... + 99097.

It is an arithmetic number, because the mean of its divisors is an integer number (12349260).

Almost surely, 2^129839722 is an apocalyptic number.

129839722 is a deficient number, since it is larger than the sum of its proper divisors (67748438).

129839722 is a wasteful number, since it uses less digits than its factorization.

129839722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1997.

The product of its digits is 108864, while the sum is 43.

The square root of 129839722 is about 11394.7234279731. The cubic root of 129839722 is about 506.3714276219.

The spelling of 129839722 in words is "one hundred twenty-nine million, eight hundred thirty-nine thousand, seven hundred twenty-two".