138889690056 has 384 divisors, whose sum is σ = 449694685440. Its totient is φ = 38320128000.

The previous prime is 138889690031. The next prime is 138889690057. The reversal of 138889690056 is 650096988831.

It is a junction number, because it is equal to n+sod(n) for n = 138889689975 and 138889690002.

It is not an unprimeable number, because it can be changed into a prime (138889690057) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 28050381 + ... + 28055331.

It is an arithmetic number, because the mean of its divisors is an integer number (1171079910).

Almost surely, 2^138889690056 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 138889690056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224847342720).

138889690056 is an abundant number, since it is smaller than the sum of its proper divisors (310804995384).

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

138889690056 is a wasteful number, since it uses less digits than its factorization.

138889690056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5077 (or 5070 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 63.

The spelling of 138889690056 in words is "one hundred thirty-eight billion, eight hundred eighty-nine million, six hundred ninety thousand, fifty-six".