138849 has 8 divisors (see below), whose sum is σ = 191232. Its totient is φ = 89520.

The previous prime is 138841. The next prime is 138863. The reversal of 138849 is 948831.

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

It is not a de Polignac number, because 138849 - 2³ = 138841 is a prime.

It is a zygodrome in base 7.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 138849.

It is not an unprimeable number, because it can be changed into a prime (138841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 654 + ... + 839.

It is an arithmetic number, because the mean of its divisors is an integer number (23904).

2¹³⁸⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

138849 is a deficient number, since it is larger than the sum of its proper divisors (52383).

138849 is a wasteful number, since it uses less digits than its factorization.

138849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1527.

The product of its digits is 6912, while the sum is 33.

The square root of 138849 is about 372.6244758467. The cubic root of 138849 is about 51.7822501958.

The spelling of 138849 in words is "one hundred thirty-eight thousand, eight hundred forty-nine".