138533671 has 4 divisors (see below), whose sum is σ = 138579952. Its totient is φ = 138487392.

The previous prime is 138533627. The next prime is 138533683. The reversal of 138533671 is 176335831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 176335831 = 7 ⋅25190833.

It is a cyclic number.

It is not a de Polignac number, because 138533671 - 2¹³ = 138525479 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 138533671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138533371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18315 + ... + 24748.

It is an arithmetic number, because the mean of its divisors is an integer number (34644988).

Almost surely, 2^138533671 is an apocalyptic number.

138533671 is a deficient number, since it is larger than the sum of its proper divisors (46281).

138533671 is an equidigital number, since it uses as much as digits as its factorization.

138533671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46280.

The product of its digits is 45360, while the sum is 37.

The square root of 138533671 is about 11770.0327527157. The cubic root of 138533671 is about 517.4302095745.

The spelling of 138533671 in words is "one hundred thirty-eight million, five hundred thirty-three thousand, six hundred seventy-one".