280217 has 4 divisors (see below), whose sum is σ = 320256. Its totient is φ = 240180.

The previous prime is 280207. The next prime is 280219. The reversal of 280217 is 712082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280217 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280217.

It is not an unprimeable number, because it can be changed into a prime (280219) 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, 20009 + ... + 20022.

It is an arithmetic number, because the mean of its divisors is an integer number (80064).

2²⁸⁰²¹⁷ is an apocalyptic number.

It is an amenable number.

280217 is a deficient number, since it is larger than the sum of its proper divisors (40039).

280217 is an equidigital number, since it uses as much as digits as its factorization.

280217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40038.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 280217 is about 529.3552682273. The cubic root of 280217 is about 65.4382223490.

Adding to 280217 its reverse (712082), we get a palindrome (992299).

The spelling of 280217 in words is "two hundred eighty thousand, two hundred seventeen".