138693678 has 8 divisors (see below), whose sum is σ = 277387368. Its totient is φ = 46231224.

The previous prime is 138693637. The next prime is 138693683. The reversal of 138693678 is 876396831.

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

138693678 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 138693678.

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, 11557801 + ... + 11557812.

It is an arithmetic number, because the mean of its divisors is an integer number (34673421).

Almost surely, 2^138693678 is an apocalyptic number.

138693678 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138693678 is a wasteful number, since it uses less digits than its factorization.

138693678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23115618.

The product of its digits is 1306368, while the sum is 51.

The square root of 138693678 is about 11776.8280109714. The cubic root of 138693678 is about 517.6293443171.

The spelling of 138693678 in words is "one hundred thirty-eight million, six hundred ninety-three thousand, six hundred seventy-eight".