515868 has 12 divisors (see below), whose sum is σ = 1203720. Its totient is φ = 171952.

The previous prime is 515861. The next prime is 515873. The reversal of 515868 is 868515.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×515868² = 532239586848, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515861) 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, 21483 + ... + 21506.

It is an arithmetic number, because the mean of its divisors is an integer number (100310).

2⁵¹⁵⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

515868 is an abundant number, since it is smaller than the sum of its proper divisors (687852).

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

515868 is a wasteful number, since it uses less digits than its factorization.

515868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42996 (or 42994 counting only the distinct ones).

The product of its digits is 9600, while the sum is 33.

The square root of 515868 is about 718.2395143683. The cubic root of 515868 is about 80.2009531337.

The spelling of 515868 in words is "five hundred fifteen thousand, eight hundred sixty-eight".