142089 has 4 divisors (see below), whose sum is σ = 189456. Its totient is φ = 94724.

The previous prime is 142067. The next prime is 142097. The reversal of 142089 is 980241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 142089 - 2⁵ = 142057 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (142019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23679 + ... + 23684.

It is an arithmetic number, because the mean of its divisors is an integer number (47364).

2¹⁴²⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

142089 is a deficient number, since it is larger than the sum of its proper divisors (47367).

142089 is an equidigital number, since it uses as much as digits as its factorization.

142089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47366.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 142089 is about 376.9469458690. The cubic root of 142089 is about 52.1819317687.

The spelling of 142089 in words is "one hundred forty-two thousand, eighty-nine".