129750840 has 96 divisors (see below), whose sum is σ = 423165600. Its totient is φ = 34479360.

The previous prime is 129750809. The next prime is 129750847. The reversal of 129750840 is 48057921.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 129750795 and 129750804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129750847) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 157630 + ... + 158450.

It is an arithmetic number, because the mean of its divisors is an integer number (4407975).

Almost surely, 2^129750840 is an apocalyptic number.

129750840 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 129750840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211582800).

129750840 is an abundant number, since it is smaller than the sum of its proper divisors (293414760).

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

129750840 is a wasteful number, since it uses less digits than its factorization.

129750840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277 (or 1270 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 129750840 is about 11390.8226217425. The cubic root of 129750840 is about 506.2558554421.

The spelling of 129750840 in words is "one hundred twenty-nine million, seven hundred fifty thousand, eight hundred forty".