138686871 has 8 divisors (see below), whose sum is σ = 194648320. Its totient is φ = 87591672.

The previous prime is 138686861. The next prime is 138686897. The reversal of 138686871 is 178686831.

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

It is not a de Polignac number, because 138686871 - 2¹¹ = 138684823 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 138686871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138686861) 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, 1216495 + ... + 1216608.

It is an arithmetic number, because the mean of its divisors is an integer number (24331040).

Almost surely, 2^138686871 is an apocalyptic number.

138686871 is a deficient number, since it is larger than the sum of its proper divisors (55961449).

138686871 is a wasteful number, since it uses less digits than its factorization.

138686871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2433125.

The product of its digits is 387072, while the sum is 48.

The square root of 138686871 is about 11776.5390077051. The cubic root of 138686871 is about 517.6208758691.

The spelling of 138686871 in words is "one hundred thirty-eight million, six hundred eighty-six thousand, eight hundred seventy-one".