8749809 has 8 divisors (see below), whose sum is σ = 12962720. Its totient is φ = 5833188.

The previous prime is 8749789. The next prime is 8749813. The reversal of 8749809 is 9089478.

It is not a de Polignac number, because 8749809 - 2¹⁵ = 8717041 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8749309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162007 + ... + 162060.

It is an arithmetic number, because the mean of its divisors is an integer number (1620340).

Almost surely, 2^8749809 is an apocalyptic number.

It is an amenable number.

8749809 is a deficient number, since it is larger than the sum of its proper divisors (4212911).

8749809 is a wasteful number, since it uses less digits than its factorization.

8749809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324076 (or 324070 counting only the distinct ones).

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

The square root of 8749809 is about 2958.0076064811. The cubic root of 8749809 is about 206.0627656167.

Subtracting from 8749809 its sum of digits (45), we obtain a square (8749764 = 2958²).

The spelling of 8749809 in words is "eight million, seven hundred forty-nine thousand, eight hundred nine".