138879448 has 8 divisors (see below), whose sum is σ = 260398980. Its totient is φ = 69439720.

The previous prime is 138879413. The next prime is 138879449. The reversal of 138879448 is 844978831.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 138879395 and 138879404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138879449) 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 as a sum of consecutive naturals, namely, 8679958 + ... + 8679973.

Almost surely, 2^138879448 is an apocalyptic number.

It is an amenable number.

138879448 is a deficient number, since it is larger than the sum of its proper divisors (121519532).

138879448 is a wasteful number, since it uses less digits than its factorization.

138879448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17359937 (or 17359933 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 52.

The square root of 138879448 is about 11784.7124699757. The cubic root of 138879448 is about 517.8603500450.

The spelling of 138879448 in words is "one hundred thirty-eight million, eight hundred seventy-nine thousand, four hundred forty-eight".