280319 has 4 divisors (see below), whose sum is σ = 301896. Its totient is φ = 258744.

The previous prime is 280303. The next prime is 280321. The reversal of 280319 is 913082.

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 280319 - 2⁴ = 280303 is a prime.

It is a super-2 number, since 2×280319² = 157157483522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 280294 and 280303.

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 280319.

It is not an unprimeable number, because it can be changed into a prime (280339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10769 + ... + 10794.

It is an arithmetic number, because the mean of its divisors is an integer number (75474).

2²⁸⁰³¹⁹ is an apocalyptic number.

280319 is a deficient number, since it is larger than the sum of its proper divisors (21577).

280319 is a wasteful number, since it uses less digits than its factorization.

280319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21576.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 280319 is about 529.4516030762. The cubic root of 280319 is about 65.4461613022.

The spelling of 280319 in words is "two hundred eighty thousand, three hundred nineteen".