280455 has 16 divisors (see below), whose sum is σ = 513024. Its totient is φ = 128160.

The previous prime is 280451. The next prime is 280463. The reversal of 280455 is 554082.

It is not a de Polignac number, because 280455 - 2² = 280451 is a prime.

It is an Ulam number.

280455 is a lucky 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 280455.

It is not an unprimeable number, because it can be changed into a prime (280451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1231 + ... + 1440.

It is an arithmetic number, because the mean of its divisors is an integer number (32064).

2²⁸⁰⁴⁵⁵ is an apocalyptic number.

280455 is a deficient number, since it is larger than the sum of its proper divisors (232569).

280455 is a wasteful number, since it uses less digits than its factorization.

280455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2686.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 280455 is about 529.5800222818. The cubic root of 280455 is about 65.4567435780.

The spelling of 280455 in words is "two hundred eighty thousand, four hundred fifty-five".