266806 has 4 divisors (see below), whose sum is σ = 400212. Its totient is φ = 133402.

The previous prime is 266801. The next prime is 266821. The reversal of 266806 is 608662.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 608662 = 2 ⋅304331.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66700 + ... + 66703.

It is an arithmetic number, because the mean of its divisors is an integer number (100053).

2²⁶⁶⁸⁰⁶ is an apocalyptic number.

266806 is a deficient number, since it is larger than the sum of its proper divisors (133406).

266806 is a wasteful number, since it uses less digits than its factorization.

266806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133405.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 266806 is about 516.5326707963. The cubic root of 266806 is about 64.3771674263.

The spelling of 266806 in words is "two hundred sixty-six thousand, eight hundred six".