266840 has 32 divisors (see below), whose sum is σ = 686880. Its totient is φ = 91392.

The previous prime is 266839. The next prime is 266863. The reversal of 266840 is 48662.

266840 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197 + ... + 756.

It is an arithmetic number, because the mean of its divisors is an integer number (21465).

2²⁶⁶⁸⁴⁰ is an apocalyptic number.

266840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266840 is an abundant number, since it is smaller than the sum of its proper divisors (420040).

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

266840 is a wasteful number, since it uses less digits than its factorization.

266840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971 (or 967 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 266840 is about 516.5655815093. The cubic root of 266840 is about 64.3799019110.

The spelling of 266840 in words is "two hundred sixty-six thousand, eight hundred forty".