511540 has 12 divisors (see below), whose sum is σ = 1074276. Its totient is φ = 204608.

The previous prime is 511523. The next prime is 511541. The reversal of 511540 is 45115.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 86436 + 425104 = 294^2 + 652^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511541) by changing a digit.

511540 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12769 + ... + 12808.

It is an arithmetic number, because the mean of its divisors is an integer number (89523).

2⁵¹¹⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

511540 is an abundant number, since it is smaller than the sum of its proper divisors (562736).

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

511540 is a wasteful number, since it uses less digits than its factorization.

511540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25586 (or 25584 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 511540 is about 715.2202457985. The cubic root of 511540 is about 79.9760344881.

Adding to 511540 its reverse (45115), we get a palindrome (556655).

The spelling of 511540 in words is "five hundred eleven thousand, five hundred forty".