138859434 has 144 divisors (see below), whose sum is σ = 385414848. Its totient is φ = 37340352.

The previous prime is 138859423. The next prime is 138859459. The reversal of 138859434 is 434958831.

138859434 is a `hidden beast` number, since 138 + 85 + 9 + 434 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 138859434.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8168194 + ... + 8168210.

It is an arithmetic number, because the mean of its divisors is an integer number (2676492).

Almost surely, 2^138859434 is an apocalyptic number.

138859434 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 138859434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192707424).

138859434 is an abundant number, since it is smaller than the sum of its proper divisors (246555414).

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

138859434 is an frugal number, since it uses more digits than its factorization.

138859434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69 (or 29 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 138859434 is about 11783.8632884127. The cubic root of 138859434 is about 517.8354724621.

The spelling of 138859434 in words is "one hundred thirty-eight million, eight hundred fifty-nine thousand, four hundred thirty-four".