3722809 has 2 divisors, whose sum is σ = 3722810. Its totient is φ = 3722808.

The previous prime is 3722801. The next prime is 3722819. The reversal of 3722809 is 9082273.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3717184 + 5625 = 1928^2 + 75^2 .

It is an emirp because it is prime and its reverse (9082273) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3722809 - 2³ = 3722801 is a prime.

It is not a weakly prime, because it can be changed into another prime (3722801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1861404 + 1861405.

It is an arithmetic number, because the mean of its divisors is an integer number (1861405).

Almost surely, 2^3722809 is an apocalyptic number.

It is an amenable number.

3722809 is a deficient number, since it is larger than the sum of its proper divisors (1).

3722809 is an equidigital number, since it uses as much as digits as its factorization.

3722809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 3722809 is about 1929.4582141109. The cubic root of 3722809 is about 154.9852084393.

The spelling of 3722809 in words is "three million, seven hundred twenty-two thousand, eight hundred nine".