18395109 has 12 divisors (see below), whose sum is σ = 26618956. Its totient is φ = 12241152.

The previous prime is 18395089. The next prime is 18395123. The reversal of 18395109 is 90159381.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11088900 + 7306209 = 3330^2 + 2703^2 .

It is not a de Polignac number, because 18395109 - 2¹² = 18391013 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 (18395149) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4539 + ... + 7575.

Almost surely, 2^18395109 is an apocalyptic number.

It is an amenable number.

18395109 is a deficient number, since it is larger than the sum of its proper divisors (8223847).

18395109 is a wasteful number, since it uses less digits than its factorization.

18395109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3716 (or 3713 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 18395109 is about 4288.9519698873. The cubic root of 18395109 is about 263.9778304386.

Adding to 18395109 its sum of digits (36), we get a triangular number (18395145 = T₆₀₆₅).

The spelling of 18395109 in words is "eighteen million, three hundred ninety-five thousand, one hundred nine".