138939841 has 8 divisors (see below), whose sum is σ = 144155520. Its totient is φ = 133752528.

The previous prime is 138939839. The next prime is 138939851. The reversal of 138939841 is 148939831.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 138939841 - 2¹ = 138939839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138939791 and 138939800.

It is not an unprimeable number, because it can be changed into a prime (138939811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3160 + ... + 16966.

It is an arithmetic number, because the mean of its divisors is an integer number (18019440).

Almost surely, 2^138939841 is an apocalyptic number.

It is an amenable number.

138939841 is a deficient number, since it is larger than the sum of its proper divisors (5215679).

138939841 is a wasteful number, since it uses less digits than its factorization.

138939841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14183.

The product of its digits is 186624, while the sum is 46.

The square root of 138939841 is about 11787.2745365500. The cubic root of 138939841 is about 517.9354046055.

The spelling of 138939841 in words is "one hundred thirty-eight million, nine hundred thirty-nine thousand, eight hundred forty-one".