280342 has 4 divisors (see below), whose sum is σ = 420516. Its totient is φ = 140170.

The previous prime is 280339. The next prime is 280351. The reversal of 280342 is 243082.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70084 + ... + 70087.

It is an arithmetic number, because the mean of its divisors is an integer number (105129).

2²⁸⁰³⁴² is an apocalyptic number.

280342 is a deficient number, since it is larger than the sum of its proper divisors (140174).

280342 is a wasteful number, since it uses less digits than its factorization.

280342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140173.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 280342 is about 529.4733232185. The cubic root of 280342 is about 65.4479511922.

The spelling of 280342 in words is "two hundred eighty thousand, three hundred forty-two".