138971056 has 60 divisors (see below), whose sum is σ = 331672968. Its totient is φ = 56050176.

The previous prime is 138971023. The next prime is 138971059. The reversal of 138971056 is 650179831.

It is not an unprimeable number, because it can be changed into a prime (138971059) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8115 + ... + 18541.

Almost surely, 2^138971056 is an apocalyptic number.

138971056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138971056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165836484).

138971056 is an abundant number, since it is smaller than the sum of its proper divisors (192701912).

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

138971056 is a wasteful number, since it uses less digits than its factorization.

138971056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10466 (or 10453 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 138971056 is about 11788.5985596253. The cubic root of 138971056 is about 517.9741891205.

The spelling of 138971056 in words is "one hundred thirty-eight million, nine hundred seventy-one thousand, fifty-six".