280312 has 16 divisors (see below), whose sum is σ = 540360. Its totient is φ = 136224.

The previous prime is 280303. The next prime is 280321. The reversal of 280312 is 213082.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (280303) and next prime (280321).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178 + ... + 769.

2²⁸⁰³¹² is an apocalyptic number.

It is an amenable number.

280312 is a deficient number, since it is larger than the sum of its proper divisors (260048).

280312 is a wasteful number, since it uses less digits than its factorization.

280312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990 (or 986 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 280312 is about 529.4449924213. Note that the first 3 decimals coincide. The cubic root of 280312 is about 65.4456165336.

Adding to 280312 its reverse (213082), we get a palindrome (493394).

The spelling of 280312 in words is "two hundred eighty thousand, three hundred twelve".