4239009 has 12 divisors (see below), whose sum is σ = 6142500. Its totient is φ = 2817024.

The previous prime is 4238999. The next prime is 4239013. The reversal of 4239009 is 9009324.

It can be written as a sum of positive squares in 2 ways, for example, as 3294225 + 944784 = 1815^2 + 972^2 .

It is not a de Polignac number, because 4239009 - 2⁸ = 4238753 is a prime.

4239009 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4239509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3517 + ... + 4565.

It is an arithmetic number, because the mean of its divisors is an integer number (511875).

Almost surely, 2^4239009 is an apocalyptic number.

It is an amenable number.

4239009 is a deficient number, since it is larger than the sum of its proper divisors (1903491).

4239009 is a wasteful number, since it uses less digits than its factorization.

4239009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504 (or 1501 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 4239009 is about 2058.8853780626. The cubic root of 4239009 is about 161.8408359002.

The spelling of 4239009 in words is "four million, two hundred thirty-nine thousand, nine".