12143538 has 24 divisors (see below), whose sum is σ = 28703376. Its totient is φ = 3679800.

The previous prime is 12143513. The next prime is 12143561. The reversal of 12143538 is 83534121.

It is a happy number.

12143538 is a `hidden beast` number, since 121 + 4 + 3 + 538 = 666.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 30468 + ... + 30863.

It is an arithmetic number, because the mean of its divisors is an integer number (1195974).

Almost surely, 2^12143538 is an apocalyptic number.

12143538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12143538 is an abundant number, since it is smaller than the sum of its proper divisors (16559838).

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

12143538 is a wasteful number, since it uses less digits than its factorization.

12143538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61350 (or 61347 counting only the distinct ones).

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

The square root of 12143538 is about 3484.7579542918. The cubic root of 12143538 is about 229.8520661814.

Adding to 12143538 its reverse (83534121), we get a palindrome (95677659).

The spelling of 12143538 in words is "twelve million, one hundred forty-three thousand, five hundred thirty-eight".