3913809 has 4 divisors (see below), whose sum is σ = 5218416. Its totient is φ = 2609204.

The previous prime is 3913807. The next prime is 3913837. The reversal of 3913809 is 9083193.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3913809 - 2¹ = 3913807 is a prime.

It is a D-number.

It is a Curzon number.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 3913809.

It is not an unprimeable number, because it can be changed into a prime (3913807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 652299 + ... + 652304.

It is an arithmetic number, because the mean of its divisors is an integer number (1304604).

Almost surely, 2^3913809 is an apocalyptic number.

It is an amenable number.

3913809 is a deficient number, since it is larger than the sum of its proper divisors (1304607).

3913809 is a wasteful number, since it uses less digits than its factorization.

3913809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304606.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 3913809 is about 1978.3349059247. The cubic root of 3913809 is about 157.5916523746.

The spelling of 3913809 in words is "three million, nine hundred thirteen thousand, eight hundred nine".