138392271 has 6 divisors (see below), whose sum is σ = 199899960. Its totient is φ = 92261508.

The previous prime is 138392269. The next prime is 138392273. The reversal of 138392271 is 172293831.

138392271 is a `hidden beast` number, since 1 + 383 + 9 + 2 + 271 = 666.

It is an interprime number because it is at equal distance from previous prime (138392269) and next prime (138392273).

It is not a de Polignac number, because 138392271 - 2¹ = 138392269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138392273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7688451 + ... + 7688468.

It is an arithmetic number, because the mean of its divisors is an integer number (33316660).

Almost surely, 2^138392271 is an apocalyptic number.

138392271 is a deficient number, since it is larger than the sum of its proper divisors (61507689).

138392271 is a wasteful number, since it uses less digits than its factorization.

138392271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15376925 (or 15376922 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 138392271 is about 11764.0244389410. The cubic root of 138392271 is about 517.2541042805.

It can be divided in two parts, 13839 and 2271, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 138392271 in words is "one hundred thirty-eight million, three hundred ninety-two thousand, two hundred seventy-one".