138123042 has 32 divisors (see below), whose sum is σ = 285880320. Its totient is φ = 44442960.

The previous prime is 138123017. The next prime is 138123067. The reversal of 138123042 is 240321831.

It is an interprime number because it is at equal distance from previous prime (138123017) and next prime (138123067).

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 15 ways as a sum of consecutive naturals, for example, 104059 + ... + 105377.

It is an arithmetic number, because the mean of its divisors is an integer number (8933760).

Almost surely, 2^138123042 is an apocalyptic number.

138123042 is an abundant number, since it is smaller than the sum of its proper divisors (147757278).

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

138123042 is a wasteful number, since it uses less digits than its factorization.

138123042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 138123042 is about 11752.5759729516. The cubic root of 138123042 is about 516.9184636470.

Adding to 138123042 its reverse (240321831), we get a palindrome (378444873).

The spelling of 138123042 in words is "one hundred thirty-eight million, one hundred twenty-three thousand, forty-two".