940809 has 4 divisors (see below), whose sum is σ = 1254416. Its totient is φ = 627204.

The previous prime is 940801. The next prime is 940813. The reversal of 940809 is 908049.

940809 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 940809 - 2³ = 940801 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

940809 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (940801) 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, 156799 + ... + 156804.

It is an arithmetic number, because the mean of its divisors is an integer number (313604).

2⁹⁴⁰⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

940809 is a deficient number, since it is larger than the sum of its proper divisors (313607).

940809 is a wasteful number, since it uses less digits than its factorization.

940809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313606.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 940809 is about 969.9530916493. The cubic root of 940809 is about 97.9867051241.

The spelling of 940809 in words is "nine hundred forty thousand, eight hundred nine".