129955456 has 16 divisors (see below), whose sum is σ = 258895890. Its totient is φ = 64977664.

The previous prime is 129955447. The next prime is 129955471. The reversal of 129955456 is 654559921.

It can be written as a sum of positive squares in only one way, i.e., 129595456 + 360000 = 11384^2 + 600^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 507511 + ... + 507766.

Almost surely, 2^129955456 is an apocalyptic number.

129955456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129955456 is a deficient number, since it is larger than the sum of its proper divisors (128940434).

129955456 is an equidigital number, since it uses as much as digits as its factorization.

129955456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015291 (or 1015279 counting only the distinct ones).

The product of its digits is 486000, while the sum is 46.

The square root of 129955456 is about 11399.8007000123. The cubic root of 129955456 is about 506.5218361049.

The spelling of 129955456 in words is "one hundred twenty-nine million, nine hundred fifty-five thousand, four hundred fifty-six".