266388 has 24 divisors (see below), whose sum is σ = 631680. Its totient is φ = 87360.

The previous prime is 266381. The next prime is 266401. The reversal of 266388 is 883662.

266388 is nontrivially palindromic in base 5.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 266388.

It is not an unprimeable number, because it can be changed into a prime (266381) by changing a digit.

266388 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 808 + ... + 1088.

It is an arithmetic number, because the mean of its divisors is an integer number (26320).

2²⁶⁶³⁸⁸ is an apocalyptic number.

It is an amenable number.

266388 is an abundant number, since it is smaller than the sum of its proper divisors (365292).

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

266388 is a wasteful number, since it uses less digits than its factorization.

266388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367 (or 365 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 266388 is about 516.1278911278. The cubic root of 266388 is about 64.3435303502.

The spelling of 266388 in words is "two hundred sixty-six thousand, three hundred eighty-eight".