942009 has 4 divisors (see below), whose sum is σ = 1256016. Its totient is φ = 628004.

The previous prime is 941999. The next prime is 942013. The reversal of 942009 is 900249.

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 942009 - 2⁸ = 941753 is a prime.

It is a D-number.

942009 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 942009.

It is not an unprimeable number, because it can be changed into a prime (942049) 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, 156999 + ... + 157004.

It is an arithmetic number, because the mean of its divisors is an integer number (314004).

2⁹⁴²⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

942009 is a deficient number, since it is larger than the sum of its proper divisors (314007).

942009 is a wasteful number, since it uses less digits than its factorization.

942009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314006.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 942009 is about 970.5714811388. The cubic root of 942009 is about 98.0283480395.

The spelling of 942009 in words is "nine hundred forty-two thousand, nine".