6990388 has 12 divisors (see below), whose sum is σ = 12346180. Its totient is φ = 3462912.

The previous prime is 6990371. The next prime is 6990419. The reversal of 6990388 is 8830996.

It can be written as a sum of positive squares in 2 ways, for example, as 1737124 + 5253264 = 1318^2 + 2292^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7581 + ... + 8452.

Almost surely, 2^6990388 is an apocalyptic number.

It is an amenable number.

6990388 is a deficient number, since it is larger than the sum of its proper divisors (5355792).

6990388 is a wasteful number, since it uses less digits than its factorization.

6990388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16146 (or 16144 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 6990388 is about 2643.9341898013. The cubic root of 6990388 is about 191.2055205773.

The spelling of 6990388 in words is "six million, nine hundred ninety thousand, three hundred eighty-eight".