138612856838 has 4 divisors (see below), whose sum is σ = 207919285260. Its totient is φ = 69306428418.

The previous prime is 138612856831. The next prime is 138612856859. The reversal of 138612856838 is 838658216831.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138612856831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34653214208 + ... + 34653214211.

It is an arithmetic number, because the mean of its divisors is an integer number (51979821315).

Almost surely, 2^138612856838 is an apocalyptic number.

138612856838 is a deficient number, since it is larger than the sum of its proper divisors (69306428422).

138612856838 is an equidigital number, since it uses as much as digits as its factorization.

138612856838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69306428421.

The product of its digits is 13271040, while the sum is 59.

The spelling of 138612856838 in words is "one hundred thirty-eight billion, six hundred twelve million, eight hundred fifty-six thousand, eight hundred thirty-eight".