4138909 has 12 divisors (see below), whose sum is σ = 4461660. Its totient is φ = 3832640.

The previous prime is 4138877. The next prime is 4138933. The reversal of 4138909 is 9098314.

It can be written as a sum of positive squares in 2 ways, for example, as 1006009 + 3132900 = 1003^2 + 1770^2 .

It is not a de Polignac number, because 4138909 - 2⁵ = 4138877 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 (4138969) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70122 + ... + 70180.

It is an arithmetic number, because the mean of its divisors is an integer number (371805).

Almost surely, 2^4138909 is an apocalyptic number.

It is an amenable number.

4138909 is a deficient number, since it is larger than the sum of its proper divisors (322751).

4138909 is an equidigital number, since it uses as much as digits as its factorization.

4138909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 4138909 is about 2034.4308786489. The cubic root of 4138909 is about 160.5567712264.

The spelling of 4138909 in words is "four million, one hundred thirty-eight thousand, nine hundred nine".