138278456 has 8 divisors (see below), whose sum is σ = 259272120. Its totient is φ = 69139224.

The previous prime is 138278449. The next prime is 138278471. The reversal of 138278456 is 654872831.

138278456 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8642396 + ... + 8642411.

It is an arithmetic number, because the mean of its divisors is an integer number (32409015).

Almost surely, 2^138278456 is an apocalyptic number.

It is an amenable number.

138278456 is a deficient number, since it is larger than the sum of its proper divisors (120993664).

138278456 is a wasteful number, since it uses less digits than its factorization.

138278456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17284813 (or 17284809 counting only the distinct ones).

The product of its digits is 322560, while the sum is 44.

The square root of 138278456 is about 11759.1860262520. The cubic root of 138278456 is about 517.1122673085.

The spelling of 138278456 in words is "one hundred thirty-eight million, two hundred seventy-eight thousand, four hundred fifty-six".