280355 has 8 divisors (see below), whose sum is σ = 343872. Its totient is φ = 219328.

The previous prime is 280351. The next prime is 280373. The reversal of 280355 is 553082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 280355 - 2² = 280351 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 280355.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280355.

It is not an unprimeable number, because it can be changed into a prime (280351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362 + ... + 831.

It is an arithmetic number, because the mean of its divisors is an integer number (42984).

2²⁸⁰³⁵⁵ is an apocalyptic number.

280355 is a deficient number, since it is larger than the sum of its proper divisors (63517).

280355 is a wasteful number, since it uses less digits than its factorization.

280355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 280355 is about 529.4855994265. The cubic root of 280355 is about 65.4489628259.

The spelling of 280355 in words is "two hundred eighty thousand, three hundred fifty-five".