129286120 has 64 divisors (see below), whose sum is σ = 307722240. Its totient is φ = 48806400.

The previous prime is 129286109. The next prime is 129286141. The reversal of 129286120 is 21682921.

It is a Harshad number since it is a multiple of its sum of digits (31).

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, 49569 + ... + 52111.

It is an arithmetic number, because the mean of its divisors is an integer number (4808160).

Almost surely, 2^129286120 is an apocalyptic number.

129286120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129286120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153861120).

129286120 is an abundant number, since it is smaller than the sum of its proper divisors (178436120).

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

129286120 is a wasteful number, since it uses less digits than its factorization.

129286120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2626 (or 2622 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 129286120 is about 11370.4054457174. The cubic root of 129286120 is about 505.6507247117.

The spelling of 129286120 in words is "one hundred twenty-nine million, two hundred eighty-six thousand, one hundred twenty".