18818189 has 16 divisors (see below), whose sum is σ = 21799680. Its totient is φ = 16096320.

The previous prime is 18818131. The next prime is 18818207. The reversal of 18818189 is 98181881.

It is a cyclic number.

It is not a de Polignac number, because 18818189 - 2¹⁶ = 18752653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18818119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10799 + ... + 12419.

It is an arithmetic number, because the mean of its divisors is an integer number (1362480).

Almost surely, 2^18818189 is an apocalyptic number.

18818189 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18818189 is a deficient number, since it is larger than the sum of its proper divisors (2981491).

18818189 is a wasteful number, since it uses less digits than its factorization.

18818189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700.

The product of its digits is 36864, while the sum is 44.

The square root of 18818189 is about 4337.9936606685. The cubic root of 18818189 is about 265.9863043432.

The spelling of 18818189 in words is "eighteen million, eight hundred eighteen thousand, one hundred eighty-nine".