280497347 has 4 divisors (see below), whose sum is σ = 302074080. Its totient is φ = 258920616.

The previous prime is 280497319. The next prime is 280497379. The reversal of 280497347 is 743794082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 280497347 - 2¹⁸ = 280235203 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 280497298 and 280497307.

It is not an unprimeable number, because it can be changed into a prime (280497307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10788347 + ... + 10788372.

It is an arithmetic number, because the mean of its divisors is an integer number (75518520).

Almost surely, 2^280497347 is an apocalyptic number.

280497347 is a deficient number, since it is larger than the sum of its proper divisors (21576733).

280497347 is a wasteful number, since it uses less digits than its factorization.

280497347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21576732.

The product of its (nonzero) digits is 338688, while the sum is 44.

The square root of 280497347 is about 16748.0550214047. The cubic root of 280497347 is about 654.6003793562.

The spelling of 280497347 in words is "two hundred eighty million, four hundred ninety-seven thousand, three hundred forty-seven".