129885856 has 12 divisors (see below), whose sum is σ = 255712842. Its totient is φ = 64942912.

The previous prime is 129885851. The next prime is 129885857. The reversal of 129885856 is 658588921.

It can be written as a sum of positive squares in only one way, i.e., 118461456 + 11424400 = 10884^2 + 3380^2 .

It is not an unprimeable number, because it can be changed into a prime (129885851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2029435 + ... + 2029498.

Almost surely, 2^129885856 is an apocalyptic number.

129885856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129885856 is a deficient number, since it is larger than the sum of its proper divisors (125826986).

129885856 is an equidigital number, since it uses as much as digits as its factorization.

129885856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4058943 (or 4058935 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 52.

The square root of 129885856 is about 11396.7476062252. The cubic root of 129885856 is about 506.4313943070.

The spelling of 129885856 in words is "one hundred twenty-nine million, eight hundred eighty-five thousand, eight hundred fifty-six".