138671256 has 32 divisors (see below), whose sum is σ = 350578800. Its totient is φ = 45703680.

The previous prime is 138671249. The next prime is 138671257. The reversal of 138671256 is 652176831.

138671256 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138671257) 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, 30325 + ... + 34596.

Almost surely, 2^138671256 is an apocalyptic number.

It is an amenable number.

138671256 is an abundant number, since it is smaller than the sum of its proper divisors (211907544).

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

138671256 is a wasteful number, since it uses less digits than its factorization.

138671256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65019 (or 65015 counting only the distinct ones).

The product of its digits is 60480, while the sum is 39.

The square root of 138671256 is about 11775.8760183691. The cubic root of 138671256 is about 517.6014485235.

The spelling of 138671256 in words is "one hundred thirty-eight million, six hundred seventy-one thousand, two hundred fifty-six".