138242122 has 8 divisors (see below), whose sum is σ = 207495972. Its totient is φ = 69076800.

The previous prime is 138242089. The next prime is 138242123. The reversal of 138242122 is 221242831.

It can be written as a sum of positive squares in 2 ways, for example, as 131997121 + 6245001 = 11489^2 + 2499^2 .

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

It is a super-2 number, since 2×138242122² = 38221768590125768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138242123) 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, 18079 + ... + 24562.

Almost surely, 2^138242122 is an apocalyptic number.

138242122 is a deficient number, since it is larger than the sum of its proper divisors (69253850).

138242122 is a wasteful number, since it uses less digits than its factorization.

138242122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44264.

The product of its digits is 1536, while the sum is 25.

The square root of 138242122 is about 11757.6410048955. The cubic root of 138242122 is about 517.0669712599.

Adding to 138242122 its reverse (221242831), we get a palindrome (359484953).

The spelling of 138242122 in words is "one hundred thirty-eight million, two hundred forty-two thousand, one hundred twenty-two".