12438531 has 24 divisors (see below), whose sum is σ = 20666880. Its totient is φ = 7061616.

The previous prime is 12438529. The next prime is 12438553. The reversal of 12438531 is 13583421.

It is a happy number.

12438531 is a `hidden beast` number, since 124 + 3 + 8 + 531 = 666.

12438531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12438531 - 2¹ = 12438529 is a prime.

It is a super-2 number, since 2×12438531² = 309434106875922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12438495 and 12438504.

It is not an unprimeable number, because it can be changed into a prime (12438511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10726 + ... + 11828.

It is an arithmetic number, because the mean of its divisors is an integer number (861120).

Almost surely, 2^12438531 is an apocalyptic number.

12438531 is a deficient number, since it is larger than the sum of its proper divisors (8228349).

12438531 is a wasteful number, since it uses less digits than its factorization.

12438531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295 (or 1292 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 12438531 is about 3526.8301631919. The cubic root of 12438531 is about 231.6983979677.

The spelling of 12438531 in words is "twelve million, four hundred thirty-eight thousand, five hundred thirty-one".