517129380 has 96 divisors (see below), whose sum is σ = 1612154880. Its totient is φ = 137617920.

The previous prime is 517129369. The next prime is 517129387. The reversal of 517129380 is 83921715.

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

It is not an unprimeable number, because it can be changed into a prime (517129387) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 475197 + ... + 476283.

It is an arithmetic number, because the mean of its divisors is an integer number (16793280).

Almost surely, 2^517129380 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 517129380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (806077440).

517129380 is an abundant number, since it is smaller than the sum of its proper divisors (1095025500).

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

517129380 is a wasteful number, since it uses less digits than its factorization.

517129380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986 (or 1978 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 517129380 is about 22740.4788867781. The cubic root of 517129380 is about 802.6626799206.

The spelling of 517129380 in words is "five hundred seventeen million, one hundred twenty-nine thousand, three hundred eighty".