138230742 has 64 divisors (see below), whose sum is σ = 308577024. Its totient is φ = 41005440.

The previous prime is 138230707. The next prime is 138230783. The reversal of 138230742 is 247032831.

138230742 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 608833 + ... + 609059.

It is an arithmetic number, because the mean of its divisors is an integer number (4821516).

Almost surely, 2^138230742 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138230742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154288512).

138230742 is an abundant number, since it is smaller than the sum of its proper divisors (170346282).

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

138230742 is a wasteful number, since it uses less digits than its factorization.

138230742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 138230742 is about 11757.1570543223. The cubic root of 138230742 is about 517.0527826669.

The spelling of 138230742 in words is "one hundred thirty-eight million, two hundred thirty thousand, seven hundred forty-two".