3920309 has 4 divisors (see below), whose sum is σ = 3955116. Its totient is φ = 3885504.

The previous prime is 3920303. The next prime is 3920311. The reversal of 3920309 is 9030293.

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 1020100 + 2900209 = 1010^2 + 1703^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3920309 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 (3920303) 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, 17234 + ... + 17459.

It is an arithmetic number, because the mean of its divisors is an integer number (988779).

Almost surely, 2^3920309 is an apocalyptic number.

It is an amenable number.

3920309 is a deficient number, since it is larger than the sum of its proper divisors (34807).

3920309 is a wasteful number, since it uses less digits than its factorization.

3920309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34806.

The product of its (nonzero) digits is 1458, while the sum is 26.

The square root of 3920309 is about 1979.9770200687. The cubic root of 3920309 is about 157.6788461365.

The spelling of 3920309 in words is "three million, nine hundred twenty thousand, three hundred nine".