866742 has 16 divisors (see below), whose sum is σ = 1824960. Its totient is φ = 273672.

The previous prime is 866737. The next prime is 866743. The reversal of 866742 is 247668.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 866742.

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

866742 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3688 + ... + 3915.

It is an arithmetic number, because the mean of its divisors is an integer number (114060).

2⁸⁶⁶⁷⁴² is an apocalyptic number.

866742 is an abundant number, since it is smaller than the sum of its proper divisors (958218).

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

866742 is a wasteful number, since it uses less digits than its factorization.

866742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7627.

The product of its digits is 16128, while the sum is 33.

The square root of 866742 is about 930.9897958624. The cubic root of 866742 is about 95.3447125913.

The spelling of 866742 in words is "eight hundred sixty-six thousand, seven hundred forty-two".