280220943 has 16 divisors (see below), whose sum is σ = 384450560. Its totient is φ = 181421856.

The previous prime is 280220929. The next prime is 280220947. The reversal of 280220943 is 349022082.

It is not a de Polignac number, because 280220943 - 2⁶ = 280220879 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 280220943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280220947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65298 + ... + 69456.

It is an arithmetic number, because the mean of its divisors is an integer number (24028160).

Almost surely, 2^280220943 is an apocalyptic number.

280220943 is a deficient number, since it is larger than the sum of its proper divisors (104229617).

280220943 is a wasteful number, since it uses less digits than its factorization.

280220943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4806.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 280220943 is about 16739.8011636937. The cubic root of 280220943 is about 654.3852927977.

The spelling of 280220943 in words is "two hundred eighty million, two hundred twenty thousand, nine hundred forty-three".