138242 has 12 divisors (see below), whose sum is σ = 225090. Its totient is φ = 63648.

The previous prime is 138241. The next prime is 138247. The reversal of 138242 is 242831.

It can be written as a sum of positive squares in 3 ways, for example, as 101761 + 36481 = 319^2 + 191^2 .

It is a super-2 number, since 2×138242² = 38221701128, which contains 22 as substring.

It is a d-powerful number, because it can be written as 1 + 3⁸ + 2⁵ + 8³ + 4³ + 2¹⁷ .

It is not an unprimeable number, because it can be changed into a prime (138241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 134 + ... + 542.

2¹³⁸²⁴² is an apocalyptic number.

138242 is a deficient number, since it is larger than the sum of its proper divisors (86848).

138242 is a wasteful number, since it uses less digits than its factorization.

138242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437 (or 424 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

The square root of 138242 is about 371.8090907980. The cubic root of 138242 is about 51.7066819154.

The spelling of 138242 in words is "one hundred thirty-eight thousand, two hundred forty-two".