266442 has 24 divisors (see below), whose sum is σ = 587328. Its totient is φ = 80520.

The previous prime is 266417. The next prime is 266447. The reversal of 266442 is 244662.

It is a d-powerful number, because it can be written as 2⁵ + 6 + 4⁶ + 6² + 4⁹ + 2⁷ .

It is not an unprimeable number, because it can be changed into a prime (266447) by changing a digit.

266442 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 11 ways as a sum of consecutive naturals, for example, 543 + ... + 909.

It is an arithmetic number, because the mean of its divisors is an integer number (24472).

2²⁶⁶⁴⁴² is an apocalyptic number.

266442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 266442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293664).

266442 is an abundant number, since it is smaller than the sum of its proper divisors (320886).

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

266442 is a wasteful number, since it uses less digits than its factorization.

266442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394 (or 383 counting only the distinct ones).

The product of its digits is 2304, while the sum is 24.

The square root of 266442 is about 516.1802010926. The cubic root of 266442 is about 64.3478777881.

The spelling of 266442 in words is "two hundred sixty-six thousand, four hundred forty-two".