511866 has 16 divisors (see below), whose sum is σ = 1137600. Its totient is φ = 170604.

The previous prime is 511859. The next prime is 511867. The reversal of 511866 is 668115.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (511867) by changing a digit.

511866 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4686 + ... + 4793.

It is an arithmetic number, because the mean of its divisors is an integer number (71100).

2⁵¹¹⁸⁶⁶ is an apocalyptic number.

511866 is an abundant number, since it is smaller than the sum of its proper divisors (625734).

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

511866 is a wasteful number, since it uses less digits than its factorization.

511866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9490 (or 9484 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 511866 is about 715.4481113260. The cubic root of 511866 is about 79.9930202244.

It can be divided in two parts, 5118 and 66, that added together give a square (5184 = 72²).

The spelling of 511866 in words is "five hundred eleven thousand, eight hundred sixty-six".