138845 has 8 divisors (see below), whose sum is σ = 190464. Its totient is φ = 95184.

The previous prime is 138841. The next prime is 138863. The reversal of 138845 is 548831.

138845 = T₇₁ + T₇₂ + ... + T₁₀₅.

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

It is a cyclic number.

It is not a de Polignac number, because 138845 - 2² = 138841 is a prime.

It is a Duffinian number.

It is a Curzon 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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1949 + ... + 2018.

It is an arithmetic number, because the mean of its divisors is an integer number (23808).

2¹³⁸⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

138845 is a deficient number, since it is larger than the sum of its proper divisors (51619).

138845 is an equidigital number, since it uses as much as digits as its factorization.

138845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3979.

The product of its digits is 3840, while the sum is 29.

The square root of 138845 is about 372.6191084741. The cubic root of 138845 is about 51.7817529386.

The spelling of 138845 in words is "one hundred thirty-eight thousand, eight hundred forty-five".