280113947 has 4 divisors (see below), whose sum is σ = 296591256. Its totient is φ = 263636640.

The previous prime is 280113919. The next prime is 280113949. The reversal of 280113947 is 749311082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280113947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280113949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8238629 + ... + 8238662.

It is an arithmetic number, because the mean of its divisors is an integer number (74147814).

Almost surely, 2^280113947 is an apocalyptic number.

280113947 is a deficient number, since it is larger than the sum of its proper divisors (16477309).

280113947 is a wasteful number, since it uses less digits than its factorization.

280113947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16477308.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 280113947 is about 16736.6050022100. The cubic root of 280113947 is about 654.3019948099.

The spelling of 280113947 in words is "two hundred eighty million, one hundred thirteen thousand, nine hundred forty-seven".