280983997 has 16 divisors (see below), whose sum is σ = 327836160. Its totient is φ = 235852848.

The previous prime is 280983979. The next prime is 280984009. The reversal of 280983997 is 799389082.

It is not a de Polignac number, because 280983997 - 2⁷ = 280983869 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 (280983977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82278 + ... + 85624.

It is an arithmetic number, because the mean of its divisors is an integer number (20489760).

Almost surely, 2^280983997 is an apocalyptic number.

It is an amenable number.

280983997 is a deficient number, since it is larger than the sum of its proper divisors (46852163).

280983997 is a wasteful number, since it uses less digits than its factorization.

280983997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3600.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The square root of 280983997 is about 16762.5772779725. The cubic root of 280983997 is about 654.9787278215.

The spelling of 280983997 in words is "two hundred eighty million, nine hundred eighty-three thousand, nine hundred ninety-seven".