12438181 has 8 divisors (see below), whose sum is σ = 14298624. Its totient is φ = 10598640.

The previous prime is 12438157. The next prime is 12438191. The reversal of 12438181 is 18183421.

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

It is a cyclic number.

It is not a de Polignac number, because 12438181 - 2⁵ = 12438149 is a prime.

It is a super-2 number, since 2×12438181² = 309416693177522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12438121) 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, 3925 + ... + 6346.

It is an arithmetic number, because the mean of its divisors is an integer number (1787328).

Almost surely, 2^12438181 is an apocalyptic number.

It is an amenable number.

12438181 is a deficient number, since it is larger than the sum of its proper divisors (1860443).

12438181 is a wasteful number, since it uses less digits than its factorization.

12438181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10451.

The product of its digits is 1536, while the sum is 28.

The square root of 12438181 is about 3526.7805432150. The cubic root of 12438181 is about 231.6962247422.

The spelling of 12438181 in words is "twelve million, four hundred thirty-eight thousand, one hundred eighty-one".