517988 has 6 divisors (see below), whose sum is σ = 906486. Its totient is φ = 258992.

The previous prime is 517981. The next prime is 517991. The reversal of 517988 is 889715.

It can be written as a sum of positive squares in only one way, i.e., 322624 + 195364 = 568^2 + 442^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 517988.

It is not an unprimeable number, because it can be changed into a prime (517981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64745 + ... + 64752.

It is an arithmetic number, because the mean of its divisors is an integer number (151081).

2⁵¹⁷⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

517988 is a deficient number, since it is larger than the sum of its proper divisors (388498).

517988 is a wasteful number, since it uses less digits than its factorization.

517988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129501 (or 129499 counting only the distinct ones).

The product of its digits is 20160, while the sum is 38.

The square root of 517988 is about 719.7138320194. The cubic root of 517988 is about 80.3106670134.

The spelling of 517988 in words is "five hundred seventeen thousand, nine hundred eighty-eight".