18468845 has 4 divisors (see below), whose sum is σ = 22162620. Its totient is φ = 14775072.

The previous prime is 18468841. The next prime is 18468847. The reversal of 18468845 is 54886481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54886481 = 13 ⋅4222037.

It can be written as a sum of positive squares in 2 ways, for example, as 13169641 + 5299204 = 3629^2 + 2302^2 .

It is a cyclic number.

It is not a de Polignac number, because 18468845 - 2² = 18468841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18468796 and 18468805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18468841) 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, 1846880 + ... + 1846889.

It is an arithmetic number, because the mean of its divisors is an integer number (5540655).

Almost surely, 2^18468845 is an apocalyptic number.

It is an amenable number.

18468845 is a deficient number, since it is larger than the sum of its proper divisors (3693775).

18468845 is an equidigital number, since it uses as much as digits as its factorization.

18468845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3693774.

The product of its digits is 245760, while the sum is 44.

The square root of 18468845 is about 4297.5394122684. The cubic root of 18468845 is about 264.3300747826.

The spelling of 18468845 in words is "eighteen million, four hundred sixty-eight thousand, eight hundred forty-five".