138847 has 4 divisors (see below), whose sum is σ = 142120. Its totient is φ = 135576.

The previous prime is 138841. The next prime is 138863. The reversal of 138847 is 748831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138841) 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 3 ways as a sum of consecutive naturals, for example, 1572 + ... + 1657.

It is an arithmetic number, because the mean of its divisors is an integer number (35530).

2¹³⁸⁸⁴⁷ is an apocalyptic number.

138847 is a deficient number, since it is larger than the sum of its proper divisors (3273).

138847 is an equidigital number, since it uses as much as digits as its factorization.

138847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3272.

The product of its digits is 5376, while the sum is 31.

The square root of 138847 is about 372.6217921700. The cubic root of 138847 is about 51.7820015684.

It can be divided in two parts, 138 and 847, that multiplied together give a triangular number (116886 = T₄₈₃).

The spelling of 138847 in words is "one hundred thirty-eight thousand, eight hundred forty-seven".