501866 has 16 divisors (see below), whose sum is σ = 812160. Its totient is φ = 231840.

The previous prime is 501863. The next prime is 501889. The reversal of 501866 is 668105.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (501863) 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, 1646 + ... + 1926.

It is an arithmetic number, because the mean of its divisors is an integer number (50760).

2⁵⁰¹⁸⁶⁶ is an apocalyptic number.

501866 is a deficient number, since it is larger than the sum of its proper divisors (310294).

501866 is a wasteful number, since it uses less digits than its factorization.

501866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 501866 is about 708.4250136747. The cubic root of 501866 is about 79.4686663699.

The spelling of 501866 in words is "five hundred one thousand, eight hundred sixty-six".