138056647 has 4 divisors (see below), whose sum is σ = 138080296. Its totient is φ = 138033000.

The previous prime is 138056629. The next prime is 138056663. The reversal of 138056647 is 746650831.

It is a happy number.

138056647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138056647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138156647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3928 + ... + 17074.

It is an arithmetic number, because the mean of its divisors is an integer number (34520074).

Almost surely, 2^138056647 is an apocalyptic number.

138056647 is a deficient number, since it is larger than the sum of its proper divisors (23649).

138056647 is a wasteful number, since it uses less digits than its factorization.

138056647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23648.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 138056647 is about 11749.7509335305. The cubic root of 138056647 is about 516.8356237345.

The spelling of 138056647 in words is "one hundred thirty-eight million, fifty-six thousand, six hundred forty-seven".