866745 has 48 divisors (see below), whose sum is σ = 1752192. Its totient is φ = 391680.

The previous prime is 866743. The next prime is 866759. The reversal of 866745 is 547668.

866745 = 166² + 167² + ... + 192².

It is a happy number.

It is not a de Polignac number, because 866745 - 2¹ = 866743 is a prime.

It is a plaindrome in base 13.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (866743) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8364 + ... + 8466.

It is an arithmetic number, because the mean of its divisors is an integer number (36504).

2⁸⁶⁶⁷⁴⁵ is an apocalyptic number.

866745 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

866745 is an abundant number, since it is smaller than the sum of its proper divisors (885447).

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

866745 is a wasteful number, since it uses less digits than its factorization.

866745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 139 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 866745 is about 930.9914070495. The cubic root of 866745 is about 95.3448225947.

The spelling of 866745 in words is "eight hundred sixty-six thousand, seven hundred forty-five".