138345246 has 72 divisors (see below), whose sum is σ = 335617464. Its totient is φ = 42515280.

The previous prime is 138345241. The next prime is 138345247. The reversal of 138345246 is 642543831.

It is a self number, because there is not a number n which added to its sum of digits gives 138345246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138345241) 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 35 ways as a sum of consecutive naturals, for example, 170181 + ... + 170991.

Almost surely, 2^138345246 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138345246, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167808732).

138345246 is an abundant number, since it is smaller than the sum of its proper divisors (197272218).

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

138345246 is an frugal number, since it uses more digits than its factorization.

138345246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850 (or 829 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 138345246 is about 11762.0255908581. The cubic root of 138345246 is about 517.1955108594.

The spelling of 138345246 in words is "one hundred thirty-eight million, three hundred forty-five thousand, two hundred forty-six".