129315750 has 32 divisors (see below), whose sum is σ = 322773984. Its totient is φ = 34484000.

The previous prime is 129315721. The next prime is 129315751. The reversal of 129315750 is 57513921.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129315751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85461 + ... + 86960.

It is an arithmetic number, because the mean of its divisors is an integer number (10086687).

Almost surely, 2^129315750 is an apocalyptic number.

129315750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129315750 is an abundant number, since it is smaller than the sum of its proper divisors (193458234).

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

129315750 is a wasteful number, since it uses less digits than its factorization.

129315750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172441 (or 172431 counting only the distinct ones).

The product of its (nonzero) digits is 9450, while the sum is 33.

The square root of 129315750 is about 11371.7083149367. The cubic root of 129315750 is about 505.6893503754.

It can be divided in two parts, 12931 and 5750, that added together give a palindrome (18681).

The spelling of 129315750 in words is "one hundred twenty-nine million, three hundred fifteen thousand, seven hundred fifty".