6900809 has 4 divisors (see below), whose sum is σ = 6918420. Its totient is φ = 6883200.

The previous prime is 6900791. The next prime is 6900821. The reversal of 6900809 is 9080096.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5508409 + 1392400 = 2347^2 + 1180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6900809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6900889) 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, 8204 + ... + 9005.

It is an arithmetic number, because the mean of its divisors is an integer number (1729605).

Almost surely, 2^6900809 is an apocalyptic number.

It is an amenable number.

6900809 is a deficient number, since it is larger than the sum of its proper divisors (17611).

6900809 is a wasteful number, since it uses less digits than its factorization.

6900809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17610.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 6900809 is about 2626.9390933175. The cubic root of 6900809 is about 190.3852662757.

The spelling of 6900809 in words is "six million, nine hundred thousand, eight hundred nine".