138447838 has 8 divisors (see below), whose sum is σ = 207824400. Its totient is φ = 69173040.

The previous prime is 138447817. The next prime is 138447839. The reversal of 138447838 is 838744831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138447839) 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, 21943 + ... + 27538.

It is an arithmetic number, because the mean of its divisors is an integer number (25978050).

Almost surely, 2^138447838 is an apocalyptic number.

138447838 is a deficient number, since it is larger than the sum of its proper divisors (69376562).

138447838 is a wasteful number, since it uses less digits than its factorization.

138447838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50882.

The product of its digits is 516096, while the sum is 46.

The square root of 138447838 is about 11766.3859362168. The cubic root of 138447838 is about 517.3233239766.

The spelling of 138447838 in words is "one hundred thirty-eight million, four hundred forty-seven thousand, eight hundred thirty-eight".