138157242 has 8 divisors (see below), whose sum is σ = 276314496. Its totient is φ = 46052412.

The previous prime is 138157241. The next prime is 138157259. The reversal of 138157242 is 242751831.

It is a sphenic number, since it is the product of 3 distinct primes.

138157242 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (138157241) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11513098 + ... + 11513109.

It is an arithmetic number, because the mean of its divisors is an integer number (34539312).

Almost surely, 2^138157242 is an apocalyptic number.

138157242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

138157242 is a wasteful number, since it uses less digits than its factorization.

138157242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23026212.

The product of its digits is 13440, while the sum is 33.

The square root of 138157242 is about 11754.0308830631. The cubic root of 138157242 is about 516.9611240467.

The spelling of 138157242 in words is "one hundred thirty-eight million, one hundred fifty-seven thousand, two hundred forty-two".