138345012 has 72 divisors (see below), whose sum is σ = 378000896. Its totient is φ = 42410304.

The previous prime is 138344959. The next prime is 138345013. The reversal of 138345012 is 210543831.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138345013) 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, 227613 + ... + 228219.

Almost surely, 2^138345012 is an apocalyptic number.

138345012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138345012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189000448).

138345012 is an abundant number, since it is smaller than the sum of its proper divisors (239655884).

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

138345012 is a wasteful number, since it uses less digits than its factorization.

138345012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117 (or 1112 counting only the distinct ones).

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

The square root of 138345012 is about 11762.0156435876. The cubic root of 138345012 is about 517.1952192609.

Adding to 138345012 its reverse (210543831), we get a palindrome (348888843).

The spelling of 138345012 in words is "one hundred thirty-eight million, three hundred forty-five thousand, twelve".