138843381 has 8 divisors (see below), whose sum is σ = 188159584. Its totient is φ = 91044720.

The previous prime is 138843379. The next prime is 138843391. The reversal of 138843381 is 183348831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138843381 - 2¹ = 138843379 is a prime.

It is a super-2 number, since 2×138843381² = 38554968895022322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138843371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379171 + ... + 379536.

It is an arithmetic number, because the mean of its divisors is an integer number (23519948).

Almost surely, 2^138843381 is an apocalyptic number.

It is an amenable number.

138843381 is a deficient number, since it is larger than the sum of its proper divisors (49316203).

138843381 is an equidigital number, since it uses as much as digits as its factorization.

138843381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758771.

The product of its digits is 55296, while the sum is 39.

The square root of 138843381 is about 11783.1821253853. The cubic root of 138843381 is about 517.8155167103.

The spelling of 138843381 in words is "one hundred thirty-eight million, eight hundred forty-three thousand, three hundred eighty-one".