138841065 has 24 divisors (see below), whose sum is σ = 262536768. Its totient is φ = 67316640.

The previous prime is 138841051. The next prime is 138841093. The reversal of 138841065 is 560148831.

It is not a de Polignac number, because 138841065 - 2⁴ = 138841049 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 139749 + ... + 140738.

It is an arithmetic number, because the mean of its divisors is an integer number (10939032).

Almost surely, 2^138841065 is an apocalyptic number.

138841065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138841065 is a deficient number, since it is larger than the sum of its proper divisors (123695703).

138841065 is a wasteful number, since it uses less digits than its factorization.

138841065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280509 (or 280506 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 138841065 is about 11783.0838493155. The cubic root of 138841065 is about 517.8126375251.

Adding to 138841065 its reverse (560148831), we get a palindrome (698989896).

The spelling of 138841065 in words is "one hundred thirty-eight million, eight hundred forty-one thousand, sixty-five".