280343387 has 2 divisors, whose sum is σ = 280343388. Its totient is φ = 280343386.

The previous prime is 280343333. The next prime is 280343407. The reversal of 280343387 is 783343082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 280343387 - 2⁸ = 280343131 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 280343387.

It is not a weakly prime, because it can be changed into another prime (280313387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140171693 + 140171694.

It is an arithmetic number, because the mean of its divisors is an integer number (140171694).

Almost surely, 2^280343387 is an apocalyptic number.

280343387 is a deficient number, since it is larger than the sum of its proper divisors (1).

280343387 is an equidigital number, since it uses as much as digits as its factorization.

280343387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 280343387 is about 16743.4580359017. The cubic root of 280343387 is about 654.4805912723.

The spelling of 280343387 in words is "two hundred eighty million, three hundred forty-three thousand, three hundred eighty-seven".