138234558 has 48 divisors (see below), whose sum is σ = 345320064. Its totient is φ = 35839440.

The previous prime is 138234541. The next prime is 138234571. The reversal of 138234558 is 855432831.

It is a Curzon number.

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, 252441 + ... + 252987.

It is an arithmetic number, because the mean of its divisors is an integer number (7194168).

Almost surely, 2^138234558 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138234558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172660032).

138234558 is an abundant number, since it is smaller than the sum of its proper divisors (207085506).

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

138234558 is an equidigital number, since it uses as much as digits as its factorization.

138234558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117 (or 570 counting only the distinct ones).

The product of its digits is 115200, while the sum is 39.

The square root of 138234558 is about 11757.3193373320. The cubic root of 138234558 is about 517.0575405455.

It can be divided in two parts, 13823 and 4558, that added together give a palindrome (18381).

The spelling of 138234558 in words is "one hundred thirty-eight million, two hundred thirty-four thousand, five hundred fifty-eight".