266540 has 12 divisors (see below), whose sum is σ = 559776. Its totient is φ = 106608.

The previous prime is 266521. The next prime is 266549. The reversal of 266540 is 45662.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 9.

It is a nialpdrome in base 13.

It is a zygodrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (266549) 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, 6644 + ... + 6683.

It is an arithmetic number, because the mean of its divisors is an integer number (46648).

2²⁶⁶⁵⁴⁰ is an apocalyptic number.

266540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266540 is an abundant number, since it is smaller than the sum of its proper divisors (293236).

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

266540 is a wasteful number, since it uses less digits than its factorization.

266540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13336 (or 13334 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 266540 is about 516.2751204542. The cubic root of 266540 is about 64.3557660828.

The spelling of 266540 in words is "two hundred sixty-six thousand, five hundred forty".