138759678 has 48 divisors (see below), whose sum is σ = 319297680. Its totient is φ = 43400448.

The previous prime is 138759653. The next prime is 138759701. The reversal of 138759678 is 876957831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 166968 + ... + 167796.

It is an arithmetic number, because the mean of its divisors is an integer number (6652035).

Almost surely, 2^138759678 is an apocalyptic number.

138759678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 138759678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159648840).

138759678 is an abundant number, since it is smaller than the sum of its proper divisors (180538002).

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

138759678 is a wasteful number, since it uses less digits than its factorization.

138759678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401 (or 1398 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The square root of 138759678 is about 11779.6297904476. The cubic root of 138759678 is about 517.7114391887.

The spelling of 138759678 in words is "one hundred thirty-eight million, seven hundred fifty-nine thousand, six hundred seventy-eight".