138856078 has 8 divisors (see below), whose sum is σ = 212214168. Its totient is φ = 68118024.

The previous prime is 138856061. The next prime is 138856097. The reversal of 138856078 is 870658831.

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

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, 654876 + ... + 655087.

It is an arithmetic number, because the mean of its divisors is an integer number (26526771).

Almost surely, 2^138856078 is an apocalyptic number.

138856078 is a deficient number, since it is larger than the sum of its proper divisors (73358090).

138856078 is a wasteful number, since it uses less digits than its factorization.

138856078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310018.

The product of its (nonzero) digits is 322560, while the sum is 46.

The square root of 138856078 is about 11783.7208894305. The cubic root of 138856078 is about 517.8313006897.

The spelling of 138856078 in words is "one hundred thirty-eight million, eight hundred fifty-six thousand, seventy-eight".