281394 has 28 divisors (see below), whose sum is σ = 636126. Its totient is φ = 93312.

The previous prime is 281381. The next prime is 281419. The reversal of 281394 is 493182.

It can be written as a sum of positive squares in only one way, i.e., 263169 + 18225 = 513^2 + 135^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon 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 281394.

It is an unprimeable number.

281394 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 13 ways as a sum of consecutive naturals, for example, 1362 + ... + 1554.

2²⁸¹³⁹⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 281394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (318063).

281394 is an abundant number, since it is smaller than the sum of its proper divisors (354732).

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

281394 is an equidigital number, since it uses as much as digits as its factorization.

281394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 198 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 281394 is about 530.4658330185. The cubic root of 281394 is about 65.5297147773.

The spelling of 281394 in words is "two hundred eighty-one thousand, three hundred ninety-four".