138587005 has 4 divisors (see below), whose sum is σ = 166304412. Its totient is φ = 110869600.

The previous prime is 138587003. The next prime is 138587023. The reversal of 138587005 is 500785831.

138587005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 102454884 + 36132121 = 10122^2 + 6011^2 .

It is not a de Polignac number, because 138587005 - 2¹ = 138587003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138587003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13858696 + ... + 13858705.

It is an arithmetic number, because the mean of its divisors is an integer number (41576103).

Almost surely, 2^138587005 is an apocalyptic number.

It is an amenable number.

138587005 is a deficient number, since it is larger than the sum of its proper divisors (27717407).

138587005 is an equidigital number, since it uses as much as digits as its factorization.

138587005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27717406.

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 138587005 is about 11772.2982038343. The cubic root of 138587005 is about 517.4966027767.

The spelling of 138587005 in words is "one hundred thirty-eight million, five hundred eighty-seven thousand, five".