138851 has 4 divisors (see below), whose sum is σ = 144912. Its totient is φ = 132792.

The previous prime is 138841. The next prime is 138863. The reversal of 138851 is 158831.

138851 is nontrivially palindromic in base 11.

138851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 158831 = 17 ⋅9343.

It is a cyclic number.

It is not a de Polignac number, because 138851 - 2¹⁰ = 137827 is a prime.

It is a Duffinian number.

138851 is a modest number, since divided by 851 gives 138 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 138851.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 138851.

It is not an unprimeable number, because it can be changed into a prime (138821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2996 + ... + 3041.

It is an arithmetic number, because the mean of its divisors is an integer number (36228).

2¹³⁸⁸⁵¹ is an apocalyptic number.

138851 is a deficient number, since it is larger than the sum of its proper divisors (6061).

138851 is an equidigital number, since it uses as much as digits as its factorization.

138851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6060.

The product of its digits is 960, while the sum is 26.

The square root of 138851 is about 372.6271595040. The cubic root of 138851 is about 51.7824988208.

It can be divided in two parts, 138 and 851, that added together give a palindrome (989).

The spelling of 138851 in words is "one hundred thirty-eight thousand, eight hundred fifty-one".