3685009 has 2 divisors, whose sum is σ = 3685010. Its totient is φ = 3685008.

The previous prime is 3685007. The next prime is 3685021. The reversal of 3685009 is 9005863.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3504384 + 180625 = 1872^2 + 425^2 .

It is a cyclic number.

It is not a de Polignac number, because 3685009 - 2¹ = 3685007 is a prime.

Together with 3685007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3685007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1842504 + 1842505.

It is an arithmetic number, because the mean of its divisors is an integer number (1842505).

Almost surely, 2^3685009 is an apocalyptic number.

It is an amenable number.

3685009 is a deficient number, since it is larger than the sum of its proper divisors (1).

3685009 is an equidigital number, since it uses as much as digits as its factorization.

3685009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 3685009 is about 1919.6377262390. The cubic root of 3685009 is about 154.4588691774.

The spelling of 3685009 in words is "three million, six hundred eighty-five thousand, nine".