4239309 has 4 divisors (see below), whose sum is σ = 5652416. Its totient is φ = 2826204.

The previous prime is 4239293. The next prime is 4239331. The reversal of 4239309 is 9039324.

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 4239309 - 2⁴ = 4239293 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4239379) 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, 706549 + ... + 706554.

It is an arithmetic number, because the mean of its divisors is an integer number (1413104).

Almost surely, 2^4239309 is an apocalyptic number.

It is an amenable number.

4239309 is a deficient number, since it is larger than the sum of its proper divisors (1413107).

4239309 is a wasteful number, since it uses less digits than its factorization.

4239309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1413106.

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 4239309 is about 2058.9582317279. The cubic root of 4239309 is about 161.8446537033.

The spelling of 4239309 in words is "four million, two hundred thirty-nine thousand, three hundred nine".