18028497 has 4 divisors (see below), whose sum is σ = 24038000. Its totient is φ = 12018996.

The previous prime is 18028477. The next prime is 18028499. The reversal of 18028497 is 79482081.

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.

It is not a de Polignac number, because 18028497 - 2⁶ = 18028433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18028499) 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, 3004747 + ... + 3004752.

It is an arithmetic number, because the mean of its divisors is an integer number (6009500).

Almost surely, 2^18028497 is an apocalyptic number.

It is an amenable number.

18028497 is a deficient number, since it is larger than the sum of its proper divisors (6009503).

18028497 is an equidigital number, since it uses as much as digits as its factorization.

18028497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6009502.

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

The square root of 18028497 is about 4245.9977625995. The cubic root of 18028497 is about 262.2123688470.

The spelling of 18028497 in words is "eighteen million, twenty-eight thousand, four hundred ninety-seven".