281439 has 6 divisors (see below), whose sum is σ = 406536. Its totient is φ = 187620.

The previous prime is 281431. The next prime is 281509. The reversal of 281439 is 934182.

It is not a de Polignac number, because 281439 - 2³ = 281431 is a prime.

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 281439.

It is not an unprimeable number, because it can be changed into a prime (281431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15627 + ... + 15644.

It is an arithmetic number, because the mean of its divisors is an integer number (67756).

2²⁸¹⁴³⁹ is an apocalyptic number.

281439 is a deficient number, since it is larger than the sum of its proper divisors (125097).

281439 is a wasteful number, since it uses less digits than its factorization.

281439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31277 (or 31274 counting only the distinct ones).

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

The square root of 281439 is about 530.5082468728. The cubic root of 281439 is about 65.5332077208.

It can be divided in two parts, 2814 and 39, that multiplied together give a triangular number (109746 = T₄₆₈).

The spelling of 281439 in words is "two hundred eighty-one thousand, four hundred thirty-nine".