138372005 has 4 divisors (see below), whose sum is σ = 166046412. Its totient is φ = 110697600.

The previous prime is 138371999. The next prime is 138372019. The reversal of 138372005 is 500273831.

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 58644964 + 79727041 = 7658^2 + 8929^2 .

It is not a de Polignac number, because 138372005 - 2¹² = 138367909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13837196 + ... + 13837205.

It is an arithmetic number, because the mean of its divisors is an integer number (41511603).

Almost surely, 2^138372005 is an apocalyptic number.

It is an amenable number.

138372005 is a deficient number, since it is larger than the sum of its proper divisors (27674407).

138372005 is an equidigital number, since it uses as much as digits as its factorization.

138372005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27674406.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 138372005 is about 11763.1630525127. The cubic root of 138372005 is about 517.2288543555.

The spelling of 138372005 in words is "one hundred thirty-eight million, three hundred seventy-two thousand, five".