280473493 has 4 divisors (see below), whose sum is σ = 280514988. Its totient is φ = 280432000.

The previous prime is 280473491. The next prime is 280473503. The reversal of 280473493 is 394374082.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19554084 + 260919409 = 4422^2 + 16153^2 .

It is a cyclic number.

It is not a de Polignac number, because 280473493 - 2¹ = 280473491 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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280473491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7996 + ... + 24997.

It is an arithmetic number, because the mean of its divisors is an integer number (70128747).

Almost surely, 2^280473493 is an apocalyptic number.

It is an amenable number.

280473493 is a deficient number, since it is larger than the sum of its proper divisors (41495).

280473493 is an equidigital number, since it uses as much as digits as its factorization.

280473493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41494.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 280473493 is about 16747.3428638695. The cubic root of 280473493 is about 654.5818226981.

The spelling of 280473493 in words is "two hundred eighty million, four hundred seventy-three thousand, four hundred ninety-three".