18268189 has 2 divisors, whose sum is σ = 18268190. Its totient is φ = 18268188.

The previous prime is 18268181. The next prime is 18268193. The reversal of 18268189 is 98186281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13816089 + 4452100 = 3717^2 + 2110^2 .

It is a cyclic number.

It is not a de Polignac number, because 18268189 - 2³ = 18268181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18268181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9134094 + 9134095.

It is an arithmetic number, because the mean of its divisors is an integer number (9134095).

Almost surely, 2^18268189 is an apocalyptic number.

It is an amenable number.

18268189 is a deficient number, since it is larger than the sum of its proper divisors (1).

18268189 is an equidigital number, since it uses as much as digits as its factorization.

18268189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 43.

The square root of 18268189 is about 4274.1302039128. The cubic root of 18268189 is about 263.3693096533.

The spelling of 18268189 in words is "eighteen million, two hundred sixty-eight thousand, one hundred eighty-nine".