12738138 has 48 divisors (see below), whose sum is σ = 30462624. Its totient is φ = 3538080.

The previous prime is 12738133. The next prime is 12738149. The reversal of 12738138 is 83183721.

12738138 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

12738138 is strictly pandigital in base 8.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12738099 and 12738108.

It is not an unprimeable number, because it can be changed into a prime (12738133) 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, 10293 + ... + 11463.

It is an arithmetic number, because the mean of its divisors is an integer number (634638).

Almost surely, 2^12738138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12738138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15231312).

12738138 is an abundant number, since it is smaller than the sum of its proper divisors (17724486).

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

12738138 is a wasteful number, since it uses less digits than its factorization.

12738138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227 (or 1220 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 12738138 is about 3569.0528155240. The cubic root of 12738138 is about 233.5439653590.

The spelling of 12738138 in words is "twelve million, seven hundred thirty-eight thousand, one hundred thirty-eight".