12138437 has 4 divisors (see below), whose sum is σ = 12218976. Its totient is φ = 12057900.

The previous prime is 12138421. The next prime is 12138449. The reversal of 12138437 is 73483121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 73483121 = 67 ⋅1096763.

It is a cyclic number.

It is not a de Polignac number, because 12138437 - 2⁴ = 12138421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12138487) 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, 40043 + ... + 40344.

It is an arithmetic number, because the mean of its divisors is an integer number (3054744).

Almost surely, 2^12138437 is an apocalyptic number.

It is an amenable number.

12138437 is a deficient number, since it is larger than the sum of its proper divisors (80539).

12138437 is an equidigital number, since it uses as much as digits as its factorization.

12138437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80538.

The product of its digits is 4032, while the sum is 29.

The square root of 12138437 is about 3484.0259757929. The cubic root of 12138437 is about 229.8198778796.

The spelling of 12138437 in words is "twelve million, one hundred thirty-eight thousand, four hundred thirty-seven".