517809140 has 12 divisors (see below), whose sum is σ = 1087399236. Its totient is φ = 207123648.

The previous prime is 517809107. The next prime is 517809161. The reversal of 517809140 is 41908715.

It can be written as a sum of positive squares in 2 ways, for example, as 127825636 + 389983504 = 11306^2 + 19748^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 517809140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12945209 + ... + 12945248.

It is an arithmetic number, because the mean of its divisors is an integer number (90616603).

Almost surely, 2^517809140 is an apocalyptic number.

It is an amenable number.

517809140 is an abundant number, since it is smaller than the sum of its proper divisors (569590096).

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

517809140 is a wasteful number, since it uses less digits than its factorization.

517809140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25890466 (or 25890464 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 517809140 is about 22755.4200137022. The cubic root of 517809140 is about 803.0142225645.

The spelling of 517809140 in words is "five hundred seventeen million, eight hundred nine thousand, one hundred forty".