18411909 has 4 divisors (see below), whose sum is σ = 24549216. Its totient is φ = 12274604.

The previous prime is 18411907. The next prime is 18411929. The reversal of 18411909 is 90911481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90911481 = 3 ⋅30303827.

It is a cyclic number.

It is not a de Polignac number, because 18411909 - 2¹ = 18411907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18411909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18411907) 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, 3068649 + ... + 3068654.

It is an arithmetic number, because the mean of its divisors is an integer number (6137304).

Almost surely, 2^18411909 is an apocalyptic number.

It is an amenable number.

18411909 is a deficient number, since it is larger than the sum of its proper divisors (6137307).

18411909 is an equidigital number, since it uses as much as digits as its factorization.

18411909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6137306.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 18411909 is about 4290.9100433358. The cubic root of 18411909 is about 264.0581684268.

The spelling of 18411909 in words is "eighteen million, four hundred eleven thousand, nine hundred nine".