138105242 has 8 divisors (see below), whose sum is σ = 225990432. Its totient is φ = 62775100.

The previous prime is 138105241. The next prime is 138105283. The reversal of 138105242 is 242501831.

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

It is not an unprimeable number, because it can be changed into a prime (138105241) 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, 3138734 + ... + 3138777.

It is an arithmetic number, because the mean of its divisors is an integer number (28248804).

Almost surely, 2^138105242 is an apocalyptic number.

138105242 is a deficient number, since it is larger than the sum of its proper divisors (87885190).

138105242 is a wasteful number, since it uses less digits than its factorization.

138105242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6277524.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 138105242 is about 11751.8186677637. The cubic root of 138105242 is about 516.8962574947.

The spelling of 138105242 in words is "one hundred thirty-eight million, one hundred five thousand, two hundred forty-two".