266789 has 4 divisors (see below), whose sum is σ = 267840. Its totient is φ = 265740.

The previous prime is 266767. The next prime is 266797. The reversal of 266789 is 987662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 266789 - 2¹² = 262693 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122 + ... + 740.

It is an arithmetic number, because the mean of its divisors is an integer number (66960).

2²⁶⁶⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

266789 is a deficient number, since it is larger than the sum of its proper divisors (1051).

266789 is an equidigital number, since it uses as much as digits as its factorization.

266789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050.

The product of its digits is 36288, while the sum is 38.

The square root of 266789 is about 516.5162146535. The cubic root of 266789 is about 64.3758000969.

The spelling of 266789 in words is "two hundred sixty-six thousand, seven hundred eighty-nine".