517991390 has 32 divisors (see below), whose sum is σ = 1066383360. Its totient is φ = 177463584.

The previous prime is 517991389. The next prime is 517991393. The reversal of 517991390 is 93199715.

It is a super-2 number, since 2×517991390² = 536630160228264200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (517991393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152531 + ... + 155889.

It is an arithmetic number, because the mean of its divisors is an integer number (33324480).

Almost surely, 2^517991390 is an apocalyptic number.

517991390 is an abundant number, since it is smaller than the sum of its proper divisors (548391970).

517991390 is a wasteful number, since it uses less digits than its factorization.

517991390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5576.

The product of its (nonzero) digits is 76545, while the sum is 44.

The square root of 517991390 is about 22759.4242018554. The cubic root of 517991390 is about 803.1084221219.

It can be divided in two parts, 5179 and 91390, that added together give a palindrome (96569).

The spelling of 517991390 in words is "five hundred seventeen million, nine hundred ninety-one thousand, three hundred ninety".