280245 has 32 divisors (see below), whose sum is σ = 546048. Its totient is φ = 119808.

The previous prime is 280243. The next prime is 280249. The reversal of 280245 is 542082.

It is not a de Polignac number, because 280245 - 2¹ = 280243 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1707 + ... + 1863.

It is an arithmetic number, because the mean of its divisors is an integer number (17064).

2²⁸⁰²⁴⁵ is an apocalyptic number.

It is an amenable number.

280245 is a deficient number, since it is larger than the sum of its proper divisors (265803).

280245 is a wasteful number, since it uses less digits than its factorization.

280245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 280245 is about 529.3817148334. The cubic root of 280245 is about 65.4404018613.

It can be divided in two parts, 280 and 245, that added together give a palindrome (525).

The spelling of 280245 in words is "two hundred eighty thousand, two hundred forty-five".