280479 has 4 divisors (see below), whose sum is σ = 373976. Its totient is φ = 186984.

The previous prime is 280463. The next prime is 280487. The reversal of 280479 is 974082.

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

It is not a de Polignac number, because 280479 - 2⁴ = 280463 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 16.

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 280479.

It is not an unprimeable number, because it can be changed into a prime (280409) 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, 46744 + ... + 46749.

It is an arithmetic number, because the mean of its divisors is an integer number (93494).

2²⁸⁰⁴⁷⁹ is an apocalyptic number.

280479 is a deficient number, since it is larger than the sum of its proper divisors (93497).

280479 is an equidigital number, since it uses as much as digits as its factorization.

280479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93496.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 280479 is about 529.6026812621. The cubic root of 280479 is about 65.4586106833.

The spelling of 280479 in words is "two hundred eighty thousand, four hundred seventy-nine".