129375440 has 80 divisors (see below), whose sum is σ = 320604480. Its totient is φ = 48384000.

The previous prime is 129375413. The next prime is 129375481. The reversal of 129375440 is 44573921.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 129375440.

It is a congruent number.

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, 341171 + ... + 341549.

It is an arithmetic number, because the mean of its divisors is an integer number (4007556).

Almost surely, 2^129375440 is an apocalyptic number.

129375440 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 129375440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160302240).

129375440 is an abundant number, since it is smaller than the sum of its proper divisors (191229040).

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

129375440 is a wasteful number, since it uses less digits than its factorization.

129375440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 129375440 is about 11374.3325078881. The cubic root of 129375440 is about 505.7671443391.

The spelling of 129375440 in words is "one hundred twenty-nine million, three hundred seventy-five thousand, four hundred forty".