142139 has 4 divisors (see below), whose sum is σ = 149640. Its totient is φ = 134640.

The previous prime is 142123. The next prime is 142151. The reversal of 142139 is 931241.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 142139 - 2⁴ = 142123 is a prime.

It is an Ulam number.

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 142139.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 142139.

It is not an unprimeable number, because it can be changed into a prime (142159) 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, 3722 + ... + 3759.

It is an arithmetic number, because the mean of its divisors is an integer number (37410).

2¹⁴²¹³⁹ is an apocalyptic number.

142139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

142139 is a deficient number, since it is larger than the sum of its proper divisors (7501).

142139 is an equidigital number, since it uses as much as digits as its factorization.

142139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7500.

The product of its digits is 216, while the sum is 20.

The square root of 142139 is about 377.0132623662. The cubic root of 142139 is about 52.1880518545.

The spelling of 142139 in words is "one hundred forty-two thousand, one hundred thirty-nine".