129805456 has 20 divisors (see below), whose sum is σ = 274361904. Its totient is φ = 59002400.

The previous prime is 129805447. The next prime is 129805457. The reversal of 129805456 is 654508921.

It is not an unprimeable number, because it can be changed into a prime (129805457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368590 + ... + 368941.

Almost surely, 2^129805456 is an apocalyptic number.

129805456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129805456 is an abundant number, since it is smaller than the sum of its proper divisors (144556448).

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

129805456 is a wasteful number, since it uses less digits than its factorization.

129805456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737550 (or 737544 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 129805456 is about 11393.2197380723. The cubic root of 129805456 is about 506.3268782095.

The spelling of 129805456 in words is "one hundred twenty-nine million, eight hundred five thousand, four hundred fifty-six".