266138 has 4 divisors (see below), whose sum is σ = 399210. Its totient is φ = 133068.

The previous prime is 266137. The next prime is 266153. The reversal of 266138 is 831662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 165649 + 100489 = 407^2 + 317^2 .

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 266138.

It is not an unprimeable number, because it can be changed into a prime (266137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66533 + ... + 66536.

2²⁶⁶¹³⁸ is an apocalyptic number.

266138 is a deficient number, since it is larger than the sum of its proper divisors (133072).

266138 is a wasteful number, since it uses less digits than its factorization.

266138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133071.

The product of its digits is 1728, while the sum is 26.

The square root of 266138 is about 515.8856462434. The cubic root of 266138 is about 64.3233956628.

It can be divided in two parts, 266 and 138, that added together give a palindrome (404).

The spelling of 266138 in words is "two hundred sixty-six thousand, one hundred thirty-eight".