6990805 has 4 divisors (see below), whose sum is σ = 8388972. Its totient is φ = 5592640.

The previous prime is 6990799. The next prime is 6990821. The reversal of 6990805 is 5080996.

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 1874161 + 5116644 = 1369^2 + 2262^2 .

It is not a de Polignac number, because 6990805 - 2⁷ = 6990677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 699076 + ... + 699085.

It is an arithmetic number, because the mean of its divisors is an integer number (2097243).

Almost surely, 2^6990805 is an apocalyptic number.

It is an amenable number.

6990805 is a deficient number, since it is larger than the sum of its proper divisors (1398167).

6990805 is a wasteful number, since it uses less digits than its factorization.

6990805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398166.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 6990805 is about 2644.0130483793. The cubic root of 6990805 is about 191.2093225177.

The spelling of 6990805 in words is "six million, nine hundred ninety thousand, eight hundred five".