281844 has 18 divisors (see below), whose sum is σ = 712530. Its totient is φ = 93936.

The previous prime is 281839. The next prime is 281849. The reversal of 281844 is 448182.

It is an interprime number because it is at equal distance from previous prime (281839) and next prime (281849).

It can be written as a sum of positive squares in only one way, i.e., 191844 + 90000 = 438^2 + 300^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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 281844.

It is not an unprimeable number, because it can be changed into a prime (281849) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3879 + ... + 3950.

It is an arithmetic number, because the mean of its divisors is an integer number (39585).

2²⁸¹⁸⁴⁴ is an apocalyptic number.

It is an amenable number.

281844 is an abundant number, since it is smaller than the sum of its proper divisors (430686).

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

281844 is a wasteful number, since it uses less digits than its factorization.

281844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7839 (or 7834 counting only the distinct ones).

The product of its digits is 2048, while the sum is 27.

The square root of 281844 is about 530.8898190774. The cubic root of 281844 is about 65.5646274698.

The spelling of 281844 in words is "two hundred eighty-one thousand, eight hundred forty-four".