266823 has 12 divisors (see below), whose sum is σ = 402480. Its totient is φ = 170016.

The previous prime is 266821. The next prime is 266837. The reversal of 266823 is 328662.

It is not a de Polignac number, because 266823 - 2¹ = 266821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266821) 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 in 11 ways as a sum of consecutive naturals, for example, 438 + ... + 851.

It is an arithmetic number, because the mean of its divisors is an integer number (33540).

2²⁶⁶⁸²³ is an apocalyptic number.

266823 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

266823 is a deficient number, since it is larger than the sum of its proper divisors (135657).

266823 is a wasteful number, since it uses less digits than its factorization.

266823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318 (or 1315 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 266823 is about 516.5491264149. The cubic root of 266823 is about 64.3785346977.

It can be divided in two parts, 266 and 823, that added together give a square (1089 = 33²).

The spelling of 266823 in words is "two hundred sixty-six thousand, eight hundred twenty-three".