4391309 has 4 divisors (see below), whose sum is σ = 4729116. Its totient is φ = 4053504.

The previous prime is 4391263. The next prime is 4391323. The reversal of 4391309 is 9031934.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2280100 + 2111209 = 1510^2 + 1453^2 .

It is not a de Polignac number, because 4391309 - 2¹⁶ = 4325773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4391339) 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, 168884 + ... + 168909.

It is an arithmetic number, because the mean of its divisors is an integer number (1182279).

Almost surely, 2^4391309 is an apocalyptic number.

It is an amenable number.

4391309 is a deficient number, since it is larger than the sum of its proper divisors (337807).

4391309 is a wasteful number, since it uses less digits than its factorization.

4391309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337806.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 4391309 is about 2095.5450365001. The cubic root of 4391309 is about 163.7562932919.

The spelling of 4391309 in words is "four million, three hundred ninety-one thousand, three hundred nine".