513685844 has 24 divisors (see below), whose sum is σ = 1034275200. Its totient is φ = 218671776.

The previous prime is 513685831. The next prime is 513685847. The reversal of 513685844 is 448586315.

It is a junction number, because it is equal to n+sod(n) for n = 513685795 and 513685804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513685847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57392 + ... + 65735.

It is an arithmetic number, because the mean of its divisors is an integer number (43094800).

Almost surely, 2^513685844 is an apocalyptic number.

It is an amenable number.

513685844 is an abundant number, since it is smaller than the sum of its proper divisors (520589356).

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

513685844 is a wasteful number, since it uses less digits than its factorization.

513685844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123287 (or 123285 counting only the distinct ones).

The product of its digits is 460800, while the sum is 44.

The square root of 513685844 is about 22664.6386249594. The cubic root of 513685844 is about 800.8770818080.

The spelling of 513685844 in words is "five hundred thirteen million, six hundred eighty-five thousand, eight hundred forty-four".