280307 has 4 divisors (see below), whose sum is σ = 295080. Its totient is φ = 265536.

The previous prime is 280303. The next prime is 280321. The reversal of 280307 is 703082.

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

It is a cyclic number.

It is not a de Polignac number, because 280307 - 2² = 280303 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280307.

It is not an unprimeable number, because it can be changed into a prime (280303) 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, 7358 + ... + 7395.

It is an arithmetic number, because the mean of its divisors is an integer number (73770).

2²⁸⁰³⁰⁷ is an apocalyptic number.

280307 is a deficient number, since it is larger than the sum of its proper divisors (14773).

280307 is a wasteful number, since it uses less digits than its factorization.

280307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14772.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 280307 is about 529.4402704744. The cubic root of 280307 is about 65.4452274077.

Adding to 280307 its reverse (703082), we get a palindrome (983389).

The spelling of 280307 in words is "two hundred eighty thousand, three hundred seven".