6990638 has 8 divisors (see below), whose sum is σ = 11102832. Its totient is φ = 3289696.

The previous prime is 6990629. The next prime is 6990667. The reversal of 6990638 is 8360996.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6990595 and 6990604.

It is a congruent number.

It is an unprimeable number.

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, 102770 + ... + 102837.

It is an arithmetic number, because the mean of its divisors is an integer number (1387854).

Almost surely, 2^6990638 is an apocalyptic number.

6990638 is a deficient number, since it is larger than the sum of its proper divisors (4112194).

6990638 is a wasteful number, since it uses less digits than its factorization.

6990638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205626.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 6990638 is about 2643.9814674086. The cubic root of 6990638 is about 191.2077999362.

The spelling of 6990638 in words is "six million, nine hundred ninety thousand, six hundred thirty-eight".