142042139 has 4 divisors (see below), whose sum is σ = 142947024. Its totient is φ = 141137256.

The previous prime is 142042129. The next prime is 142042141. The reversal of 142042139 is 931240241.

142042139 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: 931240241 = 2099 ⋅443659.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142042139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142042129) 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, 452207 + ... + 452520.

It is an arithmetic number, because the mean of its divisors is an integer number (35736756).

Almost surely, 2^142042139 is an apocalyptic number.

142042139 is a deficient number, since it is larger than the sum of its proper divisors (904885).

142042139 is an equidigital number, since it uses as much as digits as its factorization.

142042139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904884.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 142042139 is about 11918.1432698219. The cubic root of 142042139 is about 521.7619459843.

The spelling of 142042139 in words is "one hundred forty-two million, forty-two thousand, one hundred thirty-nine".