18115369 has 4 divisors (see below), whose sum is σ = 18275796. Its totient is φ = 17954944.

The previous prime is 18115367. The next prime is 18115381. The reversal of 18115369 is 96351181.

18115369 = 163² + 164² + ... + 388².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7907344 + 10208025 = 2812^2 + 3195^2 .

It is a cyclic number.

It is not a de Polignac number, because 18115369 - 2¹ = 18115367 is a prime.

It is a super-2 number, since 2×18115369² = 656333188012322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18115367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80044 + ... + 80269.

It is an arithmetic number, because the mean of its divisors is an integer number (4568949).

Almost surely, 2^18115369 is an apocalyptic number.

It is an amenable number.

18115369 is a deficient number, since it is larger than the sum of its proper divisors (160427).

18115369 is a wasteful number, since it uses less digits than its factorization.

18115369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160426.

The product of its digits is 6480, while the sum is 34.

The square root of 18115369 is about 4256.2153375975. The cubic root of 18115369 is about 262.6328591241.

The spelling of 18115369 in words is "eighteen million, one hundred fifteen thousand, three hundred sixty-nine".