138443065 has 8 divisors (see below), whose sum is σ = 166609800. Its totient is φ = 110435712.

The previous prime is 138443033. The next prime is 138443111. The reversal of 138443065 is 560344831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6285049 + 132158016 = 2507^2 + 11496^2 .

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 138443065 - 2⁵ = 138443033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138443065.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 37924 + ... + 41413.

It is an arithmetic number, because the mean of its divisors is an integer number (20826225).

Almost surely, 2^138443065 is an apocalyptic number.

It is an amenable number.

138443065 is a deficient number, since it is larger than the sum of its proper divisors (28166735).

138443065 is an equidigital number, since it uses as much as digits as its factorization.

138443065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79691.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 138443065 is about 11766.1831109328. The cubic root of 138443065 is about 517.3173789877.

Adding to 138443065 its reverse (560344831), we get a palindrome (698787896).

The spelling of 138443065 in words is "one hundred thirty-eight million, four hundred forty-three thousand, sixty-five".