280454993 has 12 divisors (see below), whose sum is σ = 347073408. Its totient is φ = 221897520.

The previous prime is 280454983. The next prime is 280455023. The reversal of 280454993 is 399454082.

It is not a de Polignac number, because 280454993 - 2²⁶ = 213346129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280454963) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117353 + ... + 119718.

It is an arithmetic number, because the mean of its divisors is an integer number (28922784).

Almost surely, 2^280454993 is an apocalyptic number.

It is an amenable number.

280454993 is a deficient number, since it is larger than the sum of its proper divisors (66618415).

280454993 is a wasteful number, since it uses less digits than its factorization.

280454993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237104 (or 237091 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 280454993 is about 16746.7905283371. The cubic root of 280454993 is about 654.5674303339.

The spelling of 280454993 in words is "two hundred eighty million, four hundred fifty-four thousand, nine hundred ninety-three".