18340121 has 4 divisors (see below), whose sum is σ = 18511632. Its totient is φ = 18168612.

The previous prime is 18340061. The next prime is 18340139. The reversal of 18340121 is 12104381.

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.

It is a cyclic number.

It is not a de Polignac number, because 18340121 - 2⁶ = 18340057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18340093 and 18340102.

It is not an unprimeable number, because it can be changed into a prime (18310121) 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 3 ways as a sum of consecutive naturals, for example, 85595 + ... + 85808.

It is an arithmetic number, because the mean of its divisors is an integer number (4627908).

Almost surely, 2^18340121 is an apocalyptic number.

It is an amenable number.

18340121 is a deficient number, since it is larger than the sum of its proper divisors (171511).

18340121 is a wasteful number, since it uses less digits than its factorization.

18340121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171510.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 18340121 is about 4282.5367482370. The cubic root of 18340121 is about 263.7145339882.

It can be divided in two parts, 183 and 40121, that added together give a palindrome (40304).

The spelling of 18340121 in words is "eighteen million, three hundred forty thousand, one hundred twenty-one".