138838973 has 8 divisors (see below), whose sum is σ = 170878848. Its totient is φ = 109850544.

The previous prime is 138838969. The next prime is 138838981. The reversal of 138838973 is 379838831.

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 138838973 - 2² = 138838969 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138838963) 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, 762761 + ... + 762942.

It is an arithmetic number, because the mean of its divisors is an integer number (21359856).

Almost surely, 2^138838973 is an apocalyptic number.

138838973 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

138838973 is a deficient number, since it is larger than the sum of its proper divisors (32039875).

138838973 is a wasteful number, since it uses less digits than its factorization.

138838973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1525723.

The product of its digits is 870912, while the sum is 50.

The square root of 138838973 is about 11782.9950776532. The cubic root of 138838973 is about 517.8100367829.

The spelling of 138838973 in words is "one hundred thirty-eight million, eight hundred thirty-eight thousand, nine hundred seventy-three".