138318047 has 4 divisors (see below), whose sum is σ = 158077776. Its totient is φ = 118558320.

The previous prime is 138318031. The next prime is 138318073. The reversal of 138318047 is 740813831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 740813831 = 23 ⋅32209297.

It is a cyclic number.

It is not a de Polignac number, because 138318047 - 2⁴ = 138318031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138317998 and 138318016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138318097) 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, 9879854 + ... + 9879867.

It is an arithmetic number, because the mean of its divisors is an integer number (39519444).

Almost surely, 2^138318047 is an apocalyptic number.

138318047 is a deficient number, since it is larger than the sum of its proper divisors (19759729).

138318047 is an equidigital number, since it uses as much as digits as its factorization.

138318047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19759728.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 138318047 is about 11760.8693131078. The cubic root of 138318047 is about 517.1616146876.

The spelling of 138318047 in words is "one hundred thirty-eight million, three hundred eighteen thousand, forty-seven".