280542 has 8 divisors (see below), whose sum is σ = 561096. Its totient is φ = 93512.

The previous prime is 280541. The next prime is 280547. The reversal of 280542 is 245082.

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

280542 is an admirable number.

It is a plaindrome in base 16.

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 280542.

It is not an unprimeable number, because it can be changed into a prime (280541) 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 3 ways as a sum of consecutive naturals, for example, 23373 + ... + 23384.

It is an arithmetic number, because the mean of its divisors is an integer number (70137).

2²⁸⁰⁵⁴² is an apocalyptic number.

280542 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

280542 is a wasteful number, since it uses less digits than its factorization.

280542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46762.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 280542 is about 529.6621564734. The cubic root of 280542 is about 65.4635113279.

Adding to 280542 its product of nonzero digits (640), we get a palindrome (281182).

The spelling of 280542 in words is "two hundred eighty thousand, five hundred forty-two".