266838 has 32 divisors (see below), whose sum is σ = 628992. Its totient is φ = 74400.

The previous prime is 266837. The next prime is 266839. The reversal of 266838 is 838662.

It is an interprime number because it is at equal distance from previous prime (266837) and next prime (266839).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 266799 and 266808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 703 + ... + 1013.

It is an arithmetic number, because the mean of its divisors is an integer number (19656).

2²⁶⁶⁸³⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314496).

266838 is an abundant number, since it is smaller than the sum of its proper divisors (362154).

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

266838 is a wasteful number, since it uses less digits than its factorization.

266838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340.

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

The square root of 266838 is about 516.5636456430. The cubic root of 266838 is about 64.3797410653.

The spelling of 266838 in words is "two hundred sixty-six thousand, eight hundred thirty-eight".