138114678 has 64 divisors (see below), whose sum is σ = 312947712. Its totient is φ = 40318080.

The previous prime is 138114677. The next prime is 138114719. The reversal of 138114678 is 876411831.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138114677) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 299368 + ... + 299828.

It is an arithmetic number, because the mean of its divisors is an integer number (4889808).

Almost surely, 2^138114678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138114678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156473856).

138114678 is an abundant number, since it is smaller than the sum of its proper divisors (174833034).

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

138114678 is a wasteful number, since it uses less digits than its factorization.

138114678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669.

The product of its digits is 32256, while the sum is 39.

The square root of 138114678 is about 11752.2201306817. The cubic root of 138114678 is about 516.9080294881.

The spelling of 138114678 in words is "one hundred thirty-eight million, one hundred fourteen thousand, six hundred seventy-eight".