280503 has 10 divisors (see below), whose sum is σ = 419144. Its totient is φ = 186948.

The previous prime is 280499. The next prime is 280507. The reversal of 280503 is 305082.

It is an interprime number because it is at equal distance from previous prime (280499) and next prime (280507).

It is not a de Polignac number, because 280503 - 2² = 280499 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 280503.

It is not an unprimeable number, because it can be changed into a prime (280507) 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 9 ways as a sum of consecutive naturals, for example, 1651 + ... + 1812.

2²⁸⁰⁵⁰³ is an apocalyptic number.

280503 is a deficient number, since it is larger than the sum of its proper divisors (138641).

280503 is an equidigital number, since it uses as much as digits as its factorization.

280503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3475 (or 3466 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 280503 is about 529.6253392730. The cubic root of 280503 is about 65.4604776820.

Adding to 280503 its reverse (305082), we get a palindrome (585585).

The spelling of 280503 in words is "two hundred eighty thousand, five hundred three".