138750242 has 8 divisors (see below), whose sum is σ = 210035100. Its totient is φ = 68738544.

The previous prime is 138750229. The next prime is 138750247. The reversal of 138750242 is 242057831.

It can be written as a sum of positive squares in 2 ways, for example, as 130622041 + 8128201 = 11429^2 + 2851^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 138750199 and 138750208.

It is not an unprimeable number, because it can be changed into a prime (138750247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318017 + ... + 318452.

Almost surely, 2^138750242 is an apocalyptic number.

138750242 is a deficient number, since it is larger than the sum of its proper divisors (71284858).

138750242 is a wasteful number, since it uses less digits than its factorization.

138750242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636580.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 138750242 is about 11779.2292617132. The cubic root of 138750242 is about 517.6997037048.

The spelling of 138750242 in words is "one hundred thirty-eight million, seven hundred fifty thousand, two hundred forty-two".