280265 has 4 divisors (see below), whose sum is σ = 336324. Its totient is φ = 224208.

The previous prime is 280253. The next prime is 280277. The reversal of 280265 is 562082.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (280253) and next prime (280277).

It can be written as a sum of positive squares in 2 ways, for example, as 179776 + 100489 = 424^2 + 317^2 .

It is a cyclic number.

It is not a de Polignac number, because 280265 - 2⁴ = 280249 is a prime.

It is a d-powerful number, because it can be written as 2² + 8² + 2⁸ + 0 + 6⁷ + 5 .

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 280265.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280265.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28022 + ... + 28031.

It is an arithmetic number, because the mean of its divisors is an integer number (84081).

2²⁸⁰²⁶⁵ is an apocalyptic number.

It is an amenable number.

280265 is a deficient number, since it is larger than the sum of its proper divisors (56059).

280265 is an equidigital number, since it uses as much as digits as its factorization.

280265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56058.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 280265 is about 529.4006044575. The cubic root of 280265 is about 65.4419585669.

It can be divided in two parts, 280 and 265, that added together give a palindrome (545).

The spelling of 280265 in words is "two hundred eighty thousand, two hundred sixty-five".