18398245 has 4 divisors (see below), whose sum is σ = 22077900. Its totient is φ = 14718592.

The previous prime is 18398227. The next prime is 18398257. The reversal of 18398245 is 54289381.

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 4124961 + 14273284 = 2031^2 + 3778^2 .

It is a cyclic number.

It is not a de Polignac number, because 18398245 - 2¹⁷ = 18267173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18398198 and 18398207.

It is a congruent number.

It is an unprimeable number.

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, 1839820 + ... + 1839829.

It is an arithmetic number, because the mean of its divisors is an integer number (5519475).

Almost surely, 2^18398245 is an apocalyptic number.

It is an amenable number.

18398245 is a deficient number, since it is larger than the sum of its proper divisors (3679655).

18398245 is an equidigital number, since it uses as much as digits as its factorization.

18398245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3679654.

The product of its digits is 69120, while the sum is 40.

The square root of 18398245 is about 4289.3175447850. The cubic root of 18398245 is about 263.9928305751.

The spelling of 18398245 in words is "eighteen million, three hundred ninety-eight thousand, two hundred forty-five".