6990909 has 4 divisors (see below), whose sum is σ = 9321216. Its totient is φ = 4660604.

The previous prime is 6990901. The next prime is 6990911. The reversal of 6990909 is 9090996.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6990909 - 2³ = 6990901 is a prime.

It is a D-number.

6990909 is a modest number, since divided by 909 gives 699 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6990901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1165149 + ... + 1165154.

It is an arithmetic number, because the mean of its divisors is an integer number (2330304).

Almost surely, 2^6990909 is an apocalyptic number.

It is an amenable number.

6990909 is a deficient number, since it is larger than the sum of its proper divisors (2330307).

6990909 is a wasteful number, since it uses less digits than its factorization.

6990909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2330306.

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 6990909 is about 2644.0327153800. The cubic root of 6990909 is about 191.2102706999.

The spelling of 6990909 in words is "six million, nine hundred ninety thousand, nine hundred nine".