511640 has 16 divisors (see below), whose sum is σ = 1151280. Its totient is φ = 204640.

The previous prime is 511633. The next prime is 511669. The reversal of 511640 is 46115.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6356 + ... + 6435.

It is an arithmetic number, because the mean of its divisors is an integer number (71955).

2⁵¹¹⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

511640 is an abundant number, since it is smaller than the sum of its proper divisors (639640).

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

511640 is a wasteful number, since it uses less digits than its factorization.

511640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12802 (or 12798 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 511640 is about 715.2901509178. The cubic root of 511640 is about 79.9812456038.

Adding to 511640 its reverse (46115), we get a palindrome (557755).

The spelling of 511640 in words is "five hundred eleven thousand, six hundred forty".