18280497 has 4 divisors (see below), whose sum is σ = 24374000. Its totient is φ = 12186996.

The previous prime is 18280487. The next prime is 18280517. The reversal of 18280497 is 79408281.

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 an emirpimes, since its reverse is a distinct semiprime: 79408281 = 3 ⋅26469427.

It is not a de Polignac number, because 18280497 - 2⁷ = 18280369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18280417) 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, 3046747 + ... + 3046752.

It is an arithmetic number, because the mean of its divisors is an integer number (6093500).

Almost surely, 2^18280497 is an apocalyptic number.

It is an amenable number.

18280497 is a deficient number, since it is larger than the sum of its proper divisors (6093503).

18280497 is an equidigital number, since it uses as much as digits as its factorization.

18280497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6093502.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 18280497 is about 4275.5697865899. The cubic root of 18280497 is about 263.4284438081.

The spelling of 18280497 in words is "eighteen million, two hundred eighty thousand, four hundred ninety-seven".