129458856 has 64 divisors (see below), whose sum is σ = 349934400. Its totient is φ = 39771648.

The previous prime is 129458753. The next prime is 129458863. The reversal of 129458856 is 658854921.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13036 + ... + 20708.

It is an arithmetic number, because the mean of its divisors is an integer number (5467725).

Almost surely, 2^129458856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129458856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174967200).

129458856 is an abundant number, since it is smaller than the sum of its proper divisors (220475544).

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

129458856 is a wasteful number, since it uses less digits than its factorization.

129458856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7738 (or 7734 counting only the distinct ones).

The product of its digits is 691200, while the sum is 48.

The square root of 129458856 is about 11377.9987695552. The cubic root of 129458856 is about 505.8758203188.

The spelling of 129458856 in words is "one hundred twenty-nine million, four hundred fifty-eight thousand, eight hundred fifty-six".