866516 has 18 divisors (see below), whose sum is σ = 1764378. Its totient is φ = 371280.

The previous prime is 866513. The next prime is 866519. The reversal of 866516 is 615668.

866516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (866513) and next prime (866519).

It can be written as a sum of positive squares in only one way, i.e., 828100 + 38416 = 910^2 + 196^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866513) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2015 + ... + 2406.

It is an arithmetic number, because the mean of its divisors is an integer number (98021).

2⁸⁶⁶⁵¹⁶ is an apocalyptic number.

It is an amenable number.

866516 is an abundant number, since it is smaller than the sum of its proper divisors (897862).

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

866516 is a wasteful number, since it uses less digits than its factorization.

866516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4439 (or 4430 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 866516 is about 930.8684117532. The cubic root of 866516 is about 95.3364249355.

The spelling of 866516 in words is "eight hundred sixty-six thousand, five hundred sixteen".