866740 has 48 divisors (see below), whose sum is σ = 2145024. Its totient is φ = 288000.

The previous prime is 866737. The next prime is 866743. The reversal of 866740 is 47668.

It is an interprime number because it is at equal distance from previous prime (866737) and next prime (866743).

It is a zygodrome in base 3.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5665 + ... + 5815.

It is an arithmetic number, because the mean of its divisors is an integer number (44688).

2⁸⁶⁶⁷⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1072512).

866740 is an abundant number, since it is smaller than the sum of its proper divisors (1278284).

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

866740 is a wasteful number, since it uses less digits than its factorization.

866740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 866740 is about 930.9887217362. The cubic root of 866740 is about 95.3446392555.

The spelling of 866740 in words is "eight hundred sixty-six thousand, seven hundred forty".