4978809 has 12 divisors (see below), whose sum is σ = 7845552. Its totient is φ = 3017400.

The previous prime is 4978801. The next prime is 4978829. The reversal of 4978809 is 9088794.

It is not a de Polignac number, because 4978809 - 2³ = 4978801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4978801) 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, 25047 + ... + 25244.

It is an arithmetic number, because the mean of its divisors is an integer number (653796).

Almost surely, 2^4978809 is an apocalyptic number.

It is an amenable number.

4978809 is a deficient number, since it is larger than the sum of its proper divisors (2866743).

4978809 is a wasteful number, since it uses less digits than its factorization.

4978809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50308 (or 50305 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 4978809 is about 2231.3244945547. The cubic root of 4978809 is about 170.7556785803.

The spelling of 4978809 in words is "four million, nine hundred seventy-eight thousand, eight hundred nine".