6985809 has 6 divisors (see below), whose sum is σ = 10090626. Its totient is φ = 4657200.

The previous prime is 6985799. The next prime is 6985829. The reversal of 6985809 is 9085896.

6985809 is a `hidden beast` number, since 69 + 8 + 580 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4112784 + 2873025 = 2028^2 + 1695^2 .

It is not a de Polignac number, because 6985809 - 2⁷ = 6985681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6985829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 388092 + ... + 388109.

It is an arithmetic number, because the mean of its divisors is an integer number (1681771).

Almost surely, 2^6985809 is an apocalyptic number.

It is an amenable number.

6985809 is a deficient number, since it is larger than the sum of its proper divisors (3104817).

6985809 is a wasteful number, since it uses less digits than its factorization.

6985809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776207 (or 776204 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 6985809 is about 2643.0681035494. The cubic root of 6985809 is about 191.1637622219.

The spelling of 6985809 in words is "six million, nine hundred eighty-five thousand, eight hundred nine".