266438 has 8 divisors (see below), whose sum is σ = 403920. Its totient is φ = 131800.

The previous prime is 266417. The next prime is 266447. The reversal of 266438 is 834662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 266438.

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 266438.

It is an unprimeable number.

266438 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 3 ways as a sum of consecutive naturals, for example, 458 + ... + 861.

It is an arithmetic number, because the mean of its divisors is an integer number (50490).

2²⁶⁶⁴³⁸ is an apocalyptic number.

266438 is a deficient number, since it is larger than the sum of its proper divisors (137482).

266438 is a wasteful number, since it uses less digits than its factorization.

266438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422.

The product of its digits is 6912, while the sum is 29.

The square root of 266438 is about 516.1763264622. The cubic root of 266438 is about 64.3475557759.

The spelling of 266438 in words is "two hundred sixty-six thousand, four hundred thirty-eight".