129992738 has 16 divisors (see below), whose sum is σ = 196538496. Its totient is φ = 64482480.

The previous prime is 129992717. The next prime is 129992743. The reversal of 129992738 is 837299921.

It is a super-2 number, since 2×129992738² = 33796223865473288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201845 + ... + 202487.

It is an arithmetic number, because the mean of its divisors is an integer number (12283656).

Almost surely, 2^129992738 is an apocalyptic number.

129992738 is a deficient number, since it is larger than the sum of its proper divisors (66545758).

129992738 is a wasteful number, since it uses less digits than its factorization.

129992738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289.

The product of its digits is 489888, while the sum is 50.

The square root of 129992738 is about 11401.4357867770. The cubic root of 129992738 is about 506.5702689606.

The spelling of 129992738 in words is "one hundred twenty-nine million, nine hundred ninety-two thousand, seven hundred thirty-eight".