138886224 has 80 divisors (see below), whose sum is σ = 368976384. Its totient is φ = 45001600.

The previous prime is 138886207. The next prime is 138886261. The reversal of 138886224 is 422688831.

It is a happy number.

It is a Cunningham number, because it is equal to 11785²-1.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282619 + ... + 283109.

Almost surely, 2^138886224 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 138886224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184488192).

138886224 is an abundant number, since it is smaller than the sum of its proper divisors (230090160).

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

138886224 is a wasteful number, since it uses less digits than its factorization.

138886224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656 (or 650 counting only the distinct ones).

The product of its digits is 147456, while the sum is 42.

The square root of 138886224 is about 11784.9999575732. Note that the first 4 decimals coincide. The cubic root of 138886224 is about 517.8687721327.

The spelling of 138886224 in words is "one hundred thirty-eight million, eight hundred eighty-six thousand, two hundred twenty-four".