6991986 has 16 divisors (see below), whose sum is σ = 14193504. Its totient is φ = 2295744.

The previous prime is 6991979. The next prime is 6991991. The reversal of 6991986 is 6891996.

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 7 ways as a sum of consecutive naturals, for example, 8295 + ... + 9098.

It is an arithmetic number, because the mean of its divisors is an integer number (887094).

Almost surely, 2^6991986 is an apocalyptic number.

6991986 is an abundant number, since it is smaller than the sum of its proper divisors (7201518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6991986 is a wasteful number, since it uses less digits than its factorization.

6991986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17465.

The product of its digits is 209952, while the sum is 48.

The square root of 6991986 is about 2644.2363737004. The cubic root of 6991986 is about 191.2200893033.

The spelling of 6991986 in words is "six million, nine hundred ninety-one thousand, nine hundred eighty-six".