280495 has 4 divisors (see below), whose sum is σ = 336600. Its totient is φ = 224392.

The previous prime is 280487. The next prime is 280499. The reversal of 280495 is 594082.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 280495 - 2³ = 280487 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28045 + ... + 28054.

It is an arithmetic number, because the mean of its divisors is an integer number (84150).

2²⁸⁰⁴⁹⁵ is an apocalyptic number.

280495 is a deficient number, since it is larger than the sum of its proper divisors (56105).

280495 is an equidigital number, since it uses as much as digits as its factorization.

280495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56104.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 280495 is about 529.6177867104. The cubic root of 280495 is about 65.4598553609.

The spelling of 280495 in words is "two hundred eighty thousand, four hundred ninety-five".