4239909 has 6 divisors (see below), whose sum is σ = 6124326. Its totient is φ = 2826600.

The previous prime is 4239881. The next prime is 4239923. The reversal of 4239909 is 9099324.

It can be written as a sum of positive squares in only one way, i.e., 4040100 + 199809 = 2010^2 + 447^2 .

It is not a de Polignac number, because 4239909 - 2⁵ = 4239877 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4239979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 235542 + ... + 235559.

It is an arithmetic number, because the mean of its divisors is an integer number (1020721).

Almost surely, 2^4239909 is an apocalyptic number.

It is an amenable number.

4239909 is a deficient number, since it is larger than the sum of its proper divisors (1884417).

4239909 is a wasteful number, since it uses less digits than its factorization.

4239909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471107 (or 471104 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 4239909 is about 2059.1039313255. The cubic root of 4239909 is about 161.8522887692.

The spelling of 4239909 in words is "four million, two hundred thirty-nine thousand, nine hundred nine".