142138443 has 4 divisors (see below), whose sum is σ = 189517928. Its totient is φ = 94758960.

The previous prime is 142138439. The next prime is 142138453. The reversal of 142138443 is 344831241.

142138443 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.

It is not a de Polignac number, because 142138443 - 2² = 142138439 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 142138443.

It is not an unprimeable number, because it can be changed into a prime (142138433) 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, 23689738 + ... + 23689743.

It is an arithmetic number, because the mean of its divisors is an integer number (47379482).

Almost surely, 2^142138443 is an apocalyptic number.

142138443 is a deficient number, since it is larger than the sum of its proper divisors (47379485).

142138443 is an equidigital number, since it uses as much as digits as its factorization.

142138443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47379484.

The product of its digits is 9216, while the sum is 30.

The square root of 142138443 is about 11922.1828118847. The cubic root of 142138443 is about 521.8798368467.

Adding to 142138443 its reverse (344831241), we get a palindrome (486969684).

The spelling of 142138443 in words is "one hundred forty-two million, one hundred thirty-eight thousand, four hundred forty-three".