142838 has 4 divisors (see below), whose sum is σ = 214260. Its totient is φ = 71418.

The previous prime is 142837. The next prime is 142841. The reversal of 142838 is 838241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 838241 = 821 ⋅1021.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 142838.

It is not an unprimeable number, because it can be changed into a prime (142837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35708 + ... + 35711.

It is an arithmetic number, because the mean of its divisors is an integer number (53565).

2¹⁴²⁸³⁸ is an apocalyptic number.

142838 is a deficient number, since it is larger than the sum of its proper divisors (71422).

142838 is an equidigital number, since it uses as much as digits as its factorization.

142838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71421.

The product of its digits is 1536, while the sum is 26.

The square root of 142838 is about 377.9391485411. The cubic root of 142838 is about 52.2734607676.

The spelling of 142838 in words is "one hundred forty-two thousand, eight hundred thirty-eight".