266538 has 16 divisors (see below), whose sum is σ = 550656. Its totient is φ = 85920.

The previous prime is 266521. The next prime is 266549. The reversal of 266538 is 835662.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 266538.

It is an unprimeable number.

266538 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 531 + ... + 902.

It is an arithmetic number, because the mean of its divisors is an integer number (34416).

2²⁶⁶⁵³⁸ is an apocalyptic number.

266538 is an abundant number, since it is smaller than the sum of its proper divisors (284118).

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

266538 is a wasteful number, since it uses less digits than its factorization.

266538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1469.

The product of its digits is 8640, while the sum is 30.

The square root of 266538 is about 516.2731834988. The cubic root of 266538 is about 64.3556051165.

The spelling of 266538 in words is "two hundred sixty-six thousand, five hundred thirty-eight".