280742 has 16 divisors (see below), whose sum is σ = 525312. Its totient is φ = 109320.

The previous prime is 280729. The next prime is 280751. The reversal of 280742 is 247082.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 758 + ... + 1065.

It is an arithmetic number, because the mean of its divisors is an integer number (32832).

2²⁸⁰⁷⁴² is an apocalyptic number.

280742 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

280742 is a deficient number, since it is larger than the sum of its proper divisors (244570).

280742 is a wasteful number, since it uses less digits than its factorization.

280742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 280742 is about 529.8509224301. The cubic root of 280742 is about 65.4790640701.

The spelling of 280742 in words is "two hundred eighty thousand, seven hundred forty-two".