129080840 has 128 divisors (see below), whose sum is σ = 346705920. Its totient is φ = 42336000.

The previous prime is 129080839. The next prime is 129080843. The reversal of 129080840 is 48080921.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 129080797 and 129080806.

It is not an unprimeable number, because it can be changed into a prime (129080843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 854765 + ... + 854915.

It is an arithmetic number, because the mean of its divisors is an integer number (2708640).

Almost surely, 2^129080840 is an apocalyptic number.

129080840 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 129080840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173352960).

129080840 is an abundant number, since it is smaller than the sum of its proper divisors (217625080).

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

129080840 is a wasteful number, since it uses less digits than its factorization.

129080840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 129080840 is about 11361.3749167959. The cubic root of 129080840 is about 505.3829595229.

The spelling of 129080840 in words is "one hundred twenty-nine million, eighty thousand, eight hundred forty".