4919809 has 4 divisors (see below), whose sum is σ = 4930560. Its totient is φ = 4909060.

The previous prime is 4919791. The next prime is 4919813. The reversal of 4919809 is 9089194.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9089194 = 2 ⋅4544597.

It is a cyclic number.

It is not a de Polignac number, because 4919809 - 2⁵ = 4919777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4919839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4657 + ... + 5614.

It is an arithmetic number, because the mean of its divisors is an integer number (1232640).

Almost surely, 2^4919809 is an apocalyptic number.

It is an amenable number.

4919809 is a deficient number, since it is larger than the sum of its proper divisors (10751).

4919809 is a wasteful number, since it uses less digits than its factorization.

4919809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10750.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 4919809 is about 2218.0642461390. The cubic root of 4919809 is about 170.0784989257.

The spelling of 4919809 in words is "four million, nine hundred nineteen thousand, eight hundred nine".