515864 has 8 divisors (see below), whose sum is σ = 967260. Its totient is φ = 257928.

The previous prime is 515861. The next prime is 515873. The reversal of 515864 is 468515.

515864 = 172² + 173² + ... + 187².

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×515864² = 532231332992, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 515864.

It is not an unprimeable number, because it can be changed into a prime (515861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32234 + ... + 32249.

2⁵¹⁵⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

515864 is a deficient number, since it is larger than the sum of its proper divisors (451396).

515864 is a wasteful number, since it uses less digits than its factorization.

515864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64489 (or 64485 counting only the distinct ones).

The product of its digits is 4800, while the sum is 29.

The square root of 515864 is about 718.2367297765. The cubic root of 515864 is about 80.2007458425.

The spelling of 515864 in words is "five hundred fifteen thousand, eight hundred sixty-four".