280305307 has 2 divisors, whose sum is σ = 280305308. Its totient is φ = 280305306.

The previous prime is 280305251. The next prime is 280305313. The reversal of 280305307 is 703503082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 280305307 - 2²³ = 271916699 is a prime.

It is not a weakly prime, because it can be changed into another prime (280305407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140152653 + 140152654.

It is an arithmetic number, because the mean of its divisors is an integer number (140152654).

Almost surely, 2^280305307 is an apocalyptic number.

280305307 is a deficient number, since it is larger than the sum of its proper divisors (1).

280305307 is an equidigital number, since it uses as much as digits as its factorization.

280305307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 280305307 is about 16742.3208367299. The cubic root of 280305307 is about 654.4509564856.

Adding to 280305307 its reverse (703503082), we get a palindrome (983808389).

The spelling of 280305307 in words is "two hundred eighty million, three hundred five thousand, three hundred seven".