142138 has 4 divisors (see below), whose sum is σ = 213210. Its totient is φ = 71068.

The previous prime is 142123. The next prime is 142151. The reversal of 142138 is 831241.

142138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831241 = 293 ⋅2837.

It can be written as a sum of positive squares in only one way, i.e., 142129 + 9 = 377^2 + 3^2 .

It is a super-2 number, since 2×142138² = 40406422088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35533 + ... + 35536.

2¹⁴²¹³⁸ is an apocalyptic number.

142138 is a deficient number, since it is larger than the sum of its proper divisors (71072).

142138 is an equidigital number, since it uses as much as digits as its factorization.

142138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71071.

The product of its digits is 192, while the sum is 19.

The square root of 142138 is about 377.0119361506. The cubic root of 142138 is about 52.1879294669.

Adding to 142138 its reverse (831241), we get a palindrome (973379).

The spelling of 142138 in words is "one hundred forty-two thousand, one hundred thirty-eight".