281366 has 4 divisors (see below), whose sum is σ = 422052. Its totient is φ = 140682.

The previous prime is 281363. The next prime is 281381. The reversal of 281366 is 663182.

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

It is an Ulam number.

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 281366.

It is not an unprimeable number, because it can be changed into a prime (281363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70340 + ... + 70343.

It is an arithmetic number, because the mean of its divisors is an integer number (105513).

2²⁸¹³⁶⁶ is an apocalyptic number.

281366 is a deficient number, since it is larger than the sum of its proper divisors (140686).

281366 is a wasteful number, since it uses less digits than its factorization.

281366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140685.

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

The square root of 281366 is about 530.4394404642. The cubic root of 281366 is about 65.5275412024.

The spelling of 281366 in words is "two hundred eighty-one thousand, three hundred sixty-six".