280748943 has 16 divisors (see below), whose sum is σ = 420216160. Its totient is φ = 185234688.

The previous prime is 280748939. The next prime is 280748957. The reversal of 280748943 is 349847082.

It is not a de Polignac number, because 280748943 - 2² = 280748939 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280748903) 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 15 ways as a sum of consecutive naturals, for example, 50980 + ... + 56217.

It is an arithmetic number, because the mean of its divisors is an integer number (26263510).

Almost surely, 2^280748943 is an apocalyptic number.

280748943 is a deficient number, since it is larger than the sum of its proper divisors (139467217).

280748943 is a wasteful number, since it uses less digits than its factorization.

280748943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107303 (or 107297 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 280748943 is about 16755.5645383854. The cubic root of 280748943 is about 654.7960385090.

The spelling of 280748943 in words is "two hundred eighty million, seven hundred forty-eight thousand, nine hundred forty-three".