281388 has 24 divisors (see below), whose sum is σ = 665280. Its totient is φ = 92560.

The previous prime is 281381. The next prime is 281419. The reversal of 281388 is 883182.

It is not an unprimeable number, because it can be changed into a prime (281381) by changing a digit.

281388 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 7 ways as a sum of consecutive naturals, for example, 1483 + ... + 1661.

It is an arithmetic number, because the mean of its divisors is an integer number (27720).

2²⁸¹³⁸⁸ is an apocalyptic number.

It is an amenable number.

281388 is an abundant number, since it is smaller than the sum of its proper divisors (383892).

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

281388 is a wasteful number, since it uses less digits than its factorization.

281388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317 (or 315 counting only the distinct ones).

The product of its digits is 3072, while the sum is 30.

The square root of 281388 is about 530.4601775817. The cubic root of 281388 is about 65.5292490234.

The spelling of 281388 in words is "two hundred eighty-one thousand, three hundred eighty-eight".