3638909 has 2 divisors, whose sum is σ = 3638910. Its totient is φ = 3638908.

The previous prime is 3638903. The next prime is 3638917. The reversal of 3638909 is 9098363.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3319684 + 319225 = 1822^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 3638909 - 2⁸ = 3638653 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3638903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1819454 + 1819455.

It is an arithmetic number, because the mean of its divisors is an integer number (1819455).

Almost surely, 2^3638909 is an apocalyptic number.

It is an amenable number.

3638909 is a deficient number, since it is larger than the sum of its proper divisors (1).

3638909 is an equidigital number, since it uses as much as digits as its factorization.

3638909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 3638909 is about 1907.5924617171. The cubic root of 3638909 is about 153.8120634273.

The spelling of 3638909 in words is "three million, six hundred thirty-eight thousand, nine hundred nine".