513646 has 16 divisors (see below), whose sum is σ = 927360. Its totient is φ = 208440.

The previous prime is 513641. The next prime is 513649. The reversal of 513646 is 646315.

It is a self number, because there is not a number n which added to its sum of digits gives 513646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513641) by changing a digit.

513646 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 7 ways as a sum of consecutive naturals, for example, 700 + ... + 1231.

It is an arithmetic number, because the mean of its divisors is an integer number (57960).

2⁵¹³⁶⁴⁶ is an apocalyptic number.

513646 is a deficient number, since it is larger than the sum of its proper divisors (413714).

513646 is a wasteful number, since it uses less digits than its factorization.

513646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1959.

The product of its digits is 2160, while the sum is 25.

The square root of 513646 is about 716.6910073386. The cubic root of 513646 is about 80.0856374618.

The spelling of 513646 in words is "five hundred thirteen thousand, six hundred forty-six".