138867771 has 32 divisors (see below), whose sum is σ = 218403328. Its totient is φ = 76826880.

The previous prime is 138867763. The next prime is 138867797. The reversal of 138867771 is 177768831.

138867771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138867771 - 2³ = 138867763 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138867771.

It is not an unprimeable number, because it can be changed into a prime (138867761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 242916 + ... + 243486.

It is an arithmetic number, because the mean of its divisors is an integer number (6825104).

Almost surely, 2^138867771 is an apocalyptic number.

138867771 is a deficient number, since it is larger than the sum of its proper divisors (79535557).

138867771 is a wasteful number, since it uses less digits than its factorization.

138867771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931.

The product of its digits is 395136, while the sum is 48.

The square root of 138867771 is about 11784.2170295697. The cubic root of 138867771 is about 517.8458357189.

The spelling of 138867771 in words is "one hundred thirty-eight million, eight hundred sixty-seven thousand, seven hundred seventy-one".