18339121 has 4 divisors (see below), whose sum is σ = 18369652. Its totient is φ = 18308592.

The previous prime is 18339089. The next prime is 18339127. The reversal of 18339121 is 12193381.

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 6948496 + 11390625 = 2636^2 + 3375^2 .

It is a cyclic number.

It is not a de Polignac number, because 18339121 - 2⁵ = 18339089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18339121.

It is not an unprimeable number, because it can be changed into a prime (18339127) 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, 14346 + ... + 15571.

It is an arithmetic number, because the mean of its divisors is an integer number (4592413).

Almost surely, 2^18339121 is an apocalyptic number.

It is an amenable number.

18339121 is a deficient number, since it is larger than the sum of its proper divisors (30531).

18339121 is an equidigital number, since it uses as much as digits as its factorization.

18339121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30530.

The product of its digits is 1296, while the sum is 28.

The square root of 18339121 is about 4282.4199934149. The cubic root of 18339121 is about 263.7097408659.

It can be divided in two parts, 183 and 39121, that added together give a cube (39304 = 34³).

The spelling of 18339121 in words is "eighteen million, three hundred thirty-nine thousand, one hundred twenty-one".