12531438 has 24 divisors (see below), whose sum is σ = 27217008. Its totient is φ = 4167072.

The previous prime is 12531437. The next prime is 12531443. The reversal of 12531438 is 83413521.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12531437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12906 + ... + 13842.

It is an arithmetic number, because the mean of its divisors is an integer number (1134042).

Almost surely, 2^12531438 is an apocalyptic number.

12531438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12531438 is an abundant number, since it is smaller than the sum of its proper divisors (14685570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12531438 is a wasteful number, since it uses less digits than its factorization.

12531438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688 (or 1685 counting only the distinct ones).

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

The square root of 12531438 is about 3539.9771185701. The cubic root of 12531438 is about 232.2738418232.

Adding to 12531438 its reverse (83413521), we get a palindrome (95944959).

The spelling of 12531438 in words is "twelve million, five hundred thirty-one thousand, four hundred thirty-eight".