138441 has 4 divisors (see below), whose sum is σ = 184592. Its totient is φ = 92292.

The previous prime is 138433. The next prime is 138449. The reversal of 138441 is 144831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (138433) and next prime (138449).

It is not a de Polignac number, because 138441 - 2³ = 138433 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

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 138441.

It is not an unprimeable number, because it can be changed into a prime (138449) 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, 23071 + ... + 23076.

It is an arithmetic number, because the mean of its divisors is an integer number (46148).

2¹³⁸⁴⁴¹ is an apocalyptic number.

It is an amenable number.

138441 is a deficient number, since it is larger than the sum of its proper divisors (46151).

138441 is an equidigital number, since it uses as much as digits as its factorization.

138441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46150.

The product of its digits is 384, while the sum is 21.

The square root of 138441 is about 372.0766050157. The cubic root of 138441 is about 51.7314806894.

The spelling of 138441 in words is "one hundred thirty-eight thousand, four hundred forty-one".