18122909 has 8 divisors (see below), whose sum is σ = 21193920. Its totient is φ = 15172416.

The previous prime is 18122899. The next prime is 18122921. The reversal of 18122909 is 90922181.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18122909 - 2¹² = 18118813 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18122989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29804 + ... + 30405.

It is an arithmetic number, because the mean of its divisors is an integer number (2649240).

Almost surely, 2^18122909 is an apocalyptic number.

It is an amenable number.

18122909 is a deficient number, since it is larger than the sum of its proper divisors (3071011).

18122909 is an equidigital number, since it uses as much as digits as its factorization.

18122909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60259.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 18122909 is about 4257.1010089027. The cubic root of 18122909 is about 262.6692918548.

The spelling of 18122909 in words is "eighteen million, one hundred twenty-two thousand, nine hundred nine".