18540369 has 12 divisors (see below), whose sum is σ = 27945216. Its totient is φ = 11822712.

The previous prime is 18540343. The next prime is 18540377. The reversal of 18540369 is 96304581.

It is not a de Polignac number, because 18540369 - 2⁸ = 18540113 is a prime.

It is a super-2 number, since 2×18540369² = 687490565312322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18540329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44577 + ... + 44990.

It is an arithmetic number, because the mean of its divisors is an integer number (2328768).

Almost surely, 2^18540369 is an apocalyptic number.

It is an amenable number.

18540369 is a deficient number, since it is larger than the sum of its proper divisors (9404847).

18540369 is a wasteful number, since it uses less digits than its factorization.

18540369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89596 (or 89593 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 18540369 is about 4305.8528771894. The cubic root of 18540369 is about 264.6708575271.

The spelling of 18540369 in words is "eighteen million, five hundred forty thousand, three hundred sixty-nine".