138731671 has 8 divisors (see below), whose sum is σ = 149657984. Its totient is φ = 127841760.

The previous prime is 138731669. The next prime is 138731683. The reversal of 138731671 is 176137831.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138731671 - 2¹ = 138731669 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 138731671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138741671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 900 + ... + 16681.

It is an arithmetic number, because the mean of its divisors is an integer number (18707248).

Almost surely, 2^138731671 is an apocalyptic number.

138731671 is a deficient number, since it is larger than the sum of its proper divisors (10926313).

138731671 is a wasteful number, since it uses less digits than its factorization.

138731671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18201.

The product of its digits is 21168, while the sum is 37.

The square root of 138731671 is about 11778.4409409735. The cubic root of 138731671 is about 517.6766055345.

The spelling of 138731671 in words is "one hundred thirty-eight million, seven hundred thirty-one thousand, six hundred seventy-one".