280349947 has 2 divisors, whose sum is σ = 280349948. Its totient is φ = 280349946.

The previous prime is 280349939. The next prime is 280349983. The reversal of 280349947 is 749943082.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 280349947 - 2³ = 280349939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 280349897 and 280349906.

It is not a weakly prime, because it can be changed into another prime (280349347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140174973 + 140174974.

It is an arithmetic number, because the mean of its divisors is an integer number (140174974).

Almost surely, 2^280349947 is an apocalyptic number.

280349947 is a deficient number, since it is larger than the sum of its proper divisors (1).

280349947 is an equidigital number, since it uses as much as digits as its factorization.

280349947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 280349947 is about 16743.6539321619. The cubic root of 280349947 is about 654.4856961536.

The spelling of 280349947 in words is "two hundred eighty million, three hundred forty-nine thousand, nine hundred forty-seven".