138771 has 12 divisors (see below), whose sum is σ = 212472. Its totient is φ = 86976.

The previous prime is 138763. The next prime is 138793. The reversal of 138771 is 177831.

It is not a de Polignac number, because 138771 - 2³ = 138763 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 138771.

It is not an unprimeable number, because it can be changed into a prime (138731) 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, 301 + ... + 606.

It is an arithmetic number, because the mean of its divisors is an integer number (17706).

2¹³⁸⁷⁷¹ is an apocalyptic number.

138771 is a deficient number, since it is larger than the sum of its proper divisors (73701).

138771 is a wasteful number, since it uses less digits than its factorization.

138771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930 (or 927 counting only the distinct ones).

The product of its digits is 1176, while the sum is 27.

The square root of 138771 is about 372.5197981316. The cubic root of 138771 is about 51.7725519575.

Subtracting 138771 from its reverse (177831), we obtain a triangular number (39060 = T₂₇₉).

It can be divided in two parts, 138 and 771, that added together give a palindrome (909).

The spelling of 138771 in words is "one hundred thirty-eight thousand, seven hundred seventy-one".