138520005 has 48 divisors (see below), whose sum is σ = 244757376. Its totient is φ = 66842880.

The previous prime is 138520003. The next prime is 138520069. The reversal of 138520005 is 500025831.

It is not a de Polignac number, because 138520005 - 2¹ = 138520003 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138520003) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 133840 + ... + 134870.

It is an arithmetic number, because the mean of its divisors is an integer number (5099112).

Almost surely, 2^138520005 is an apocalyptic number.

138520005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138520005 is a deficient number, since it is larger than the sum of its proper divisors (106237371).

138520005 is a wasteful number, since it uses less digits than its factorization.

138520005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118 (or 1105 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 138520005 is about 11769.4521962579. The cubic root of 138520005 is about 517.4131946165.

Adding to 138520005 its reverse (500025831), we get a palindrome (638545836).

The spelling of 138520005 in words is "one hundred thirty-eight million, five hundred twenty thousand, five".