138786 has 8 divisors (see below), whose sum is σ = 277584. Its totient is φ = 46260.

The previous prime is 138763. The next prime is 138793. The reversal of 138786 is 687831.

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

138786 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11560 + ... + 11571.

It is an arithmetic number, because the mean of its divisors is an integer number (34698).

2¹³⁸⁷⁸⁶ is an apocalyptic number.

138786 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138786 is a wasteful number, since it uses less digits than its factorization.

138786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23136.

The product of its digits is 8064, while the sum is 33.

The square root of 138786 is about 372.5399307457. The cubic root of 138786 is about 51.7744172855.

The spelling of 138786 in words is "one hundred thirty-eight thousand, seven hundred eighty-six".