12238181 has 4 divisors (see below), whose sum is σ = 12958092. Its totient is φ = 11518272.

The previous prime is 12238159. The next prime is 12238183. The reversal of 12238181 is 18183221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18183221 = 7 ⋅2597603.

It can be written as a sum of positive squares in 2 ways, for example, as 8797156 + 3441025 = 2966^2 + 1855^2 .

It is a cyclic number.

It is not a de Polignac number, because 12238181 - 2⁶ = 12238117 is a prime.

It is a super-2 number, since 2×12238181² = 299546148377522, which contains 22 as substring.

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 12238181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12238183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359930 + ... + 359963.

It is an arithmetic number, because the mean of its divisors is an integer number (3239523).

Almost surely, 2^12238181 is an apocalyptic number.

It is an amenable number.

12238181 is a deficient number, since it is larger than the sum of its proper divisors (719911).

12238181 is an equidigital number, since it uses as much as digits as its factorization.

12238181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719910.

The product of its digits is 768, while the sum is 26.

The square root of 12238181 is about 3498.3111639761. The cubic root of 12238181 is about 230.4476536771.

The spelling of 12238181 in words is "twelve million, two hundred thirty-eight thousand, one hundred eighty-one".