866942 has 4 divisors (see below), whose sum is σ = 1300416. Its totient is φ = 433470.

The previous prime is 866941. The next prime is 866953. The reversal of 866942 is 249668.

It is a semiprime because it is the product of two primes.

It is an Ulam number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216734 + ... + 216737.

It is an arithmetic number, because the mean of its divisors is an integer number (325104).

2⁸⁶⁶⁹⁴² is an apocalyptic number.

866942 is a deficient number, since it is larger than the sum of its proper divisors (433474).

866942 is a wasteful number, since it uses less digits than its factorization.

866942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433473.

The product of its digits is 20736, while the sum is 35.

The square root of 866942 is about 931.0972022297. The cubic root of 866942 is about 95.3520455985.

The spelling of 866942 in words is "eight hundred sixty-six thousand, nine hundred forty-two".