142009 has 4 divisors (see below), whose sum is σ = 162304. Its totient is φ = 121716.

The previous prime is 142007. The next prime is 142019. The reversal of 142009 is 900241.

142009 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 142009 - 2¹ = 142007 is a prime.

It is a Duffinian number.

142009 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 141983 and 142001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142007) 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, 10137 + ... + 10150.

It is an arithmetic number, because the mean of its divisors is an integer number (40576).

2¹⁴²⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

142009 is a deficient number, since it is larger than the sum of its proper divisors (20295).

142009 is an equidigital number, since it uses as much as digits as its factorization.

142009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20294.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 142009 is about 376.8408151992. The cubic root of 142009 is about 52.1721366444.

The spelling of 142009 in words is "one hundred forty-two thousand, nine".