1818385 has 4 divisors (see below), whose sum is σ = 2182068. Its totient is φ = 1454704.

The previous prime is 1818379. The next prime is 1818407. The reversal of 1818385 is 5838181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5838181 = 1549 ⋅3769.

It can be written as a sum of positive squares in 2 ways, for example, as 898704 + 919681 = 948^2 + 959^2 .

It is a cyclic number.

It is not a de Polignac number, because 1818385 - 2⁵ = 1818353 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1818385.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181834 + ... + 181843.

It is an arithmetic number, because the mean of its divisors is an integer number (545517).

2^1818385 is an apocalyptic number.

It is an amenable number.

1818385 is a deficient number, since it is larger than the sum of its proper divisors (363683).

1818385 is an equidigital number, since it uses as much as digits as its factorization.

1818385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363682.

The product of its digits is 7680, while the sum is 34.

The square root of 1818385 is about 1348.4750646564. The cubic root of 1818385 is about 122.0567907238.

The spelling of 1818385 in words is "one million, eight hundred eighteen thousand, three hundred eighty-five".