866481 has 32 divisors (see below), whose sum is σ = 1499136. Its totient is φ = 435600.

The previous prime is 866477. The next prime is 866513. The reversal of 866481 is 184668.

866481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 866481 - 2² = 866477 is a prime.

It is a super-2 number, since 2×866481² = 1501578646722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

866481 is a lucky number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (866431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27936 + ... + 27966.

It is an arithmetic number, because the mean of its divisors is an integer number (46848).

2⁸⁶⁶⁴⁸¹ is an apocalyptic number.

It is an amenable number.

866481 is a deficient number, since it is larger than the sum of its proper divisors (632655).

866481 is a wasteful number, since it uses less digits than its factorization.

866481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74 (or 52 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 866481 is about 930.8496119138. The cubic root of 866481 is about 95.3351413201.

The spelling of 866481 in words is "eight hundred sixty-six thousand, four hundred eighty-one".