280240897 has 4 divisors (see below), whose sum is σ = 280276416. Its totient is φ = 280205380.

The previous prime is 280240889. The next prime is 280240943. The reversal of 280240897 is 798042082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 798042082 = 2 ⋅399021041.

It is a cyclic number.

It is not a de Polignac number, because 280240897 - 2³ = 280240889 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280240817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13 + ... + 23674.

It is an arithmetic number, because the mean of its divisors is an integer number (70069104).

Almost surely, 2^280240897 is an apocalyptic number.

It is an amenable number.

280240897 is a deficient number, since it is larger than the sum of its proper divisors (35519).

280240897 is a wasteful number, since it uses less digits than its factorization.

280240897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35518.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 280240897 is about 16740.3971577738. The cubic root of 280240897 is about 654.4008249395.

The spelling of 280240897 in words is "two hundred eighty million, two hundred forty thousand, eight hundred ninety-seven".