939409 has 4 divisors (see below), whose sum is σ = 946404. Its totient is φ = 932416.

The previous prime is 939391. The next prime is 939413. The reversal of 939409 is 904939.

939409 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 an emirpimes, since its reverse is a distinct semiprime: 904939 = 7 ⋅129277.

It can be written as a sum of positive squares in 2 ways, for example, as 199809 + 739600 = 447^2 + 860^2 .

It is a cyclic number.

It is not a de Polignac number, because 939409 - 2⁵ = 939377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (939439) 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, 3292 + ... + 3565.

It is an arithmetic number, because the mean of its divisors is an integer number (236601).

2⁹³⁹⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

939409 is a deficient number, since it is larger than the sum of its proper divisors (6995).

939409 is a wasteful number, since it uses less digits than its factorization.

939409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6994.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 939409 is about 969.2311385836. The cubic root of 939409 is about 97.9380769438.

The spelling of 939409 in words is "nine hundred thirty-nine thousand, four hundred nine".