138871441 has 6 divisors (see below), whose sum is σ = 141189126. Its totient is φ = 136591200.

The previous prime is 138871429. The next prime is 138871489. The reversal of 138871441 is 144178831.

It can be written as a sum of positive squares in 3 ways, for example, as 103041 + 138768400 = 321^2 + 11780^2 .

It is not a de Polignac number, because 138871441 - 2⁹ = 138870929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138871441.

It is not an unprimeable number, because it can be changed into a prime (138871541) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14940 + ... + 22381.

It is an arithmetic number, because the mean of its divisors is an integer number (23531521).

Almost surely, 2^138871441 is an apocalyptic number.

It is an amenable number.

138871441 is a deficient number, since it is larger than the sum of its proper divisors (2317685).

138871441 is an frugal number, since it uses more digits than its factorization.

138871441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37443 (or 37382 counting only the distinct ones).

The product of its digits is 21504, while the sum is 37.

The square root of 138871441 is about 11784.3727452928. The cubic root of 138871441 is about 517.8503975585.

The spelling of 138871441 in words is "one hundred thirty-eight million, eight hundred seventy-one thousand, four hundred forty-one".