280349 has 4 divisors (see below), whose sum is σ = 287964. Its totient is φ = 272736.

The previous prime is 280339. The next prime is 280351. The reversal of 280349 is 943082.

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

It can be written as a sum of positive squares in 2 ways, for example, as 105625 + 174724 = 325^2 + 418^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280349 is a prime.

It is a Duffinian number.

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 280349.

It is not an unprimeable number, because it can be changed into a prime (280339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3752 + ... + 3825.

It is an arithmetic number, because the mean of its divisors is an integer number (71991).

2²⁸⁰³⁴⁹ is an apocalyptic number.

It is an amenable number.

280349 is a deficient number, since it is larger than the sum of its proper divisors (7615).

280349 is an equidigital number, since it uses as much as digits as its factorization.

280349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7614.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 280349 is about 529.4799335197. The cubic root of 280349 is about 65.4484959219.

The spelling of 280349 in words is "two hundred eighty thousand, three hundred forty-nine".