4013909 has 2 divisors, whose sum is σ = 4013910. Its totient is φ = 4013908.

The previous prime is 4013897. The next prime is 4013917. The reversal of 4013909 is 9093104.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3073009 + 940900 = 1753^2 + 970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4013909 is a prime.

It is a super-2 number, since 2×4013909² = 32222930920562, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4013929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2006954 + 2006955.

It is an arithmetic number, because the mean of its divisors is an integer number (2006955).

Almost surely, 2^4013909 is an apocalyptic number.

It is an amenable number.

4013909 is a deficient number, since it is larger than the sum of its proper divisors (1).

4013909 is an equidigital number, since it uses as much as digits as its factorization.

4013909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 4013909 is about 2003.4742324273. The cubic root of 4013909 is about 158.9238853549.

The spelling of 4013909 in words is "four million, thirteen thousand, nine hundred nine".