517989 has 4 divisors (see below), whose sum is σ = 690656. Its totient is φ = 345324.

The previous prime is 517981. The next prime is 517991. The reversal of 517989 is 989715.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 517989 - 2³ = 517981 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86329 + ... + 86334.

It is an arithmetic number, because the mean of its divisors is an integer number (172664).

2⁵¹⁷⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

517989 is a deficient number, since it is larger than the sum of its proper divisors (172667).

517989 is a wasteful number, since it uses less digits than its factorization.

517989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172666.

The product of its digits is 22680, while the sum is 39.

The square root of 517989 is about 719.7145267396. The cubic root of 517989 is about 80.3107186946.

The spelling of 517989 in words is "five hundred seventeen thousand, nine hundred eighty-nine".