6991996 has 12 divisors (see below), whose sum is σ = 13348440. Its totient is φ = 3178160.

The previous prime is 6991993. The next prime is 6991997.

It is a happy number.

6991996 is nontrivially palindromic in base 10.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6991991) 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, 79411 + ... + 79498.

It is an arithmetic number, because the mean of its divisors is an integer number (1112370).

Almost surely, 2^6991996 is an apocalyptic number.

It is an amenable number.

6991996 is a deficient number, since it is larger than the sum of its proper divisors (6356444).

6991996 is a wasteful number, since it uses less digits than its factorization.

6991996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158924 (or 158922 counting only the distinct ones).

The product of its digits is 236196, while the sum is 49.

The square root of 6991996 is about 2644.2382646048. The cubic root of 6991996 is about 191.2201804648.

The spelling of 6991996 in words is "six million, nine hundred ninety-one thousand, nine hundred ninety-six".