138565005 has 16 divisors (see below), whose sum is σ = 233373120. Its totient is φ = 70011648.

The previous prime is 138565003. The next prime is 138565013. The reversal of 138565005 is 500565831.

It is not a de Polignac number, because 138565005 - 2¹ = 138565003 is a prime.

It is a super-2 number, since 2×138565005² = 38400521221300050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138565003) 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 15 ways as a sum of consecutive naturals, for example, 242812 + ... + 243381.

It is an arithmetic number, because the mean of its divisors is an integer number (14585820).

Almost surely, 2^138565005 is an apocalyptic number.

138565005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138565005 is a deficient number, since it is larger than the sum of its proper divisors (94808115).

138565005 is a wasteful number, since it uses less digits than its factorization.

138565005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486220.

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 138565005 is about 11771.3637697592. The cubic root of 138565005 is about 517.4692179875.

The spelling of 138565005 in words is "one hundred thirty-eight million, five hundred sixty-five thousand, five".