129738256 has 10 divisors (see below), whose sum is σ = 251367902. Its totient is φ = 64869120.

The previous prime is 129738241. The next prime is 129738281. The reversal of 129738256 is 652837921.

It can be written as a sum of positive squares in only one way, i.e., 71978256 + 57760000 = 8484^2 + 7600^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4054305 + ... + 4054336.

Almost surely, 2^129738256 is an apocalyptic number.

129738256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129738256 is a deficient number, since it is larger than the sum of its proper divisors (121629646).

129738256 is an equidigital number, since it uses as much as digits as its factorization.

129738256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8108649 (or 8108643 counting only the distinct ones).

The product of its digits is 181440, while the sum is 43.

The square root of 129738256 is about 11390.2702338443. The cubic root of 129738256 is about 506.2394883556.

The spelling of 129738256 in words is "one hundred twenty-nine million, seven hundred thirty-eight thousand, two hundred fifty-six".