129081240 has 96 divisors (see below), whose sum is σ = 421087680. Its totient is φ = 34292736.

The previous prime is 129081229. The next prime is 129081257. The reversal of 129081240 is 42180921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131632 + ... + 132608.

It is an arithmetic number, because the mean of its divisors is an integer number (4386330).

Almost surely, 2^129081240 is an apocalyptic number.

129081240 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 129081240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210543840).

129081240 is an abundant number, since it is smaller than the sum of its proper divisors (292006440).

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

129081240 is a wasteful number, since it uses less digits than its factorization.

129081240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361 (or 1354 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 129081240 is about 11361.3925202855. The cubic root of 129081240 is about 505.3834815549.

The spelling of 129081240 in words is "one hundred twenty-nine million, eighty-one thousand, two hundred forty".