4920809 has 4 divisors (see below), whose sum is σ = 5001540. Its totient is φ = 4840080.

The previous prime is 4920793. The next prime is 4920833. The reversal of 4920809 is 9080294.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9080294 = 2 ⋅4540147.

It can be written as a sum of positive squares in 2 ways, for example, as 426409 + 4494400 = 653^2 + 2120^2 .

It is a cyclic number.

It is not a de Polignac number, because 4920809 - 2⁴ = 4920793 is a prime.

It is a super-2 number, since 2×4920809² = 48428722428962, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4920109) 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, 40274 + ... + 40395.

It is an arithmetic number, because the mean of its divisors is an integer number (1250385).

Almost surely, 2^4920809 is an apocalyptic number.

It is an amenable number.

4920809 is a deficient number, since it is larger than the sum of its proper divisors (80731).

4920809 is an equidigital number, since it uses as much as digits as its factorization.

4920809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80730.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 4920809 is about 2218.2896564696. The cubic root of 4920809 is about 170.0900215259.

The spelling of 4920809 in words is "four million, nine hundred twenty thousand, eight hundred nine".