281642 has 8 divisors (see below), whose sum is σ = 430596. Its totient is φ = 138112.

The previous prime is 281641. The next prime is 281647. The reversal of 281642 is 246182.

281642 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 271441 + 10201 = 521^2 + 101^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (281641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1223 + ... + 1434.

2²⁸¹⁶⁴² is an apocalyptic number.

281642 is a deficient number, since it is larger than the sum of its proper divisors (148954).

281642 is a wasteful number, since it uses less digits than its factorization.

281642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2712.

The product of its digits is 768, while the sum is 23.

The square root of 281642 is about 530.6995383454. The cubic root of 281642 is about 65.5489601502.

The spelling of 281642 in words is "two hundred eighty-one thousand, six hundred forty-two".