138126042 has 48 divisors (see below), whose sum is σ = 305173440. Its totient is φ = 45144000.

The previous prime is 138126041. The next prime is 138126073. The reversal of 138126042 is 240621831.

138126042 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 138125997 and 138126015.

It is not an unprimeable number, because it can be changed into a prime (138126041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 241617 + ... + 242187.

It is an arithmetic number, because the mean of its divisors is an integer number (6357780).

Almost surely, 2^138126042 is an apocalyptic number.

138126042 is an abundant number, since it is smaller than the sum of its proper divisors (167047398).

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

138126042 is a wasteful number, since it uses less digits than its factorization.

138126042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819 (or 816 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 138126042 is about 11752.7036038522. The cubic root of 138126042 is about 516.9222060691.

Adding to 138126042 its reverse (240621831), we get a palindrome (378747873).

The spelling of 138126042 in words is "one hundred thirty-eight million, one hundred twenty-six thousand, forty-two".