138139224 has 64 divisors (see below), whose sum is σ = 360944640. Its totient is φ = 44004480.

The previous prime is 138139217. The next prime is 138139259. The reversal of 138139224 is 422931831.

138139224 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60634 + ... + 62870.

It is an arithmetic number, because the mean of its divisors is an integer number (5639760).

Almost surely, 2^138139224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138139224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180472320).

138139224 is an abundant number, since it is smaller than the sum of its proper divisors (222805416).

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

138139224 is a wasteful number, since it uses less digits than its factorization.

138139224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2360 (or 2356 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 138139224 is about 11753.2643976046. The cubic root of 138139224 is about 516.9386496295.

The spelling of 138139224 in words is "one hundred thirty-eight million, one hundred thirty-nine thousand, two hundred twenty-four".