280748939 has 2 divisors, whose sum is σ = 280748940. Its totient is φ = 280748938.

The previous prime is 280748917. The next prime is 280748957. The reversal of 280748939 is 939847082.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280748939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (280748969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140374469 + 140374470.

It is an arithmetic number, because the mean of its divisors is an integer number (140374470).

Almost surely, 2^280748939 is an apocalyptic number.

280748939 is a deficient number, since it is larger than the sum of its proper divisors (1).

280748939 is an equidigital number, since it uses as much as digits as its factorization.

280748939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 280748939 is about 16755.5644190221. The cubic root of 280748939 is about 654.7960353992.

The spelling of 280748939 in words is "two hundred eighty million, seven hundred forty-eight thousand, nine hundred thirty-nine".