1818189 has 6 divisors (see below), whose sum is σ = 2626286. Its totient is φ = 1212120.

The previous prime is 1818163. The next prime is 1818199. The reversal of 1818189 is 9818181.

It can be written as a sum of positive squares in only one way, i.e., 1542564 + 275625 = 1242^2 + 525^2 .

It is not a de Polignac number, because 1818189 - 2⁹ = 1817677 is a prime.

It is a super-2 number, since 2×1818189² = 6611622479442, which contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 101002 + ... + 101019.

2^1818189 is an apocalyptic number.

It is an amenable number.

1818189 is a deficient number, since it is larger than the sum of its proper divisors (808097).

1818189 is a wasteful number, since it uses less digits than its factorization.

1818189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202027 (or 202024 counting only the distinct ones).

The product of its digits is 4608, while the sum is 36.

The square root of 1818189 is about 1348.4023880133. The cubic root of 1818189 is about 122.0524051489.

The spelling of 1818189 in words is "one million, eight hundred eighteen thousand, one hundred eighty-nine".