280939947 has 24 divisors (see below), whose sum is σ = 398221200. Its totient is φ = 176143680.

The previous prime is 280939937. The next prime is 280939951. The reversal of 280939947 is 749939082.

It is not a de Polignac number, because 280939947 - 2⁴ = 280939931 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 280939947.

It is not an unprimeable number, because it can be changed into a prime (280939937) 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 in 23 ways as a sum of consecutive naturals, for example, 160497 + ... + 162237.

It is an arithmetic number, because the mean of its divisors is an integer number (16592550).

Almost surely, 2^280939947 is an apocalyptic number.

280939947 is a deficient number, since it is larger than the sum of its proper divisors (117281253).

280939947 is a wasteful number, since it uses less digits than its factorization.

280939947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1931 (or 1912 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 51.

The square root of 280939947 is about 16761.2632877119. The cubic root of 280939947 is about 654.9444989198.

The spelling of 280939947 in words is "two hundred eighty million, nine hundred thirty-nine thousand, nine hundred forty-seven".