6991930 has 32 divisors (see below), whose sum is σ = 14541120. Its totient is φ = 2392320.

The previous prime is 6991903. The next prime is 6991939. The reversal of 6991930 is 391996.

6991930 is a nontrivial binomial coefficient, being equal to C(3740, 2).

It is a self number, because there is not a number n which added to its sum of digits gives 6991930.

It is not an unprimeable number, because it can be changed into a prime (6991939) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1 + ... + 3739.

It is an arithmetic number, because the mean of its divisors is an integer number (454410).

Almost surely, 2^6991930 is an apocalyptic number.

6991930 is the 3739-th triangular number and also the 1870-th hexagonal number.

6991930 is the 1247-th centered nonagonal number.

6991930 is an abundant number, since it is smaller than the sum of its proper divisors (7549190).

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

6991930 is a wasteful number, since it uses less digits than its factorization.

6991930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3774.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 6991930 is about 2644.2257846107. The cubic root of 6991930 is about 191.2195787972.

It can be divided in two parts, 6991 and 930, that added together give a square (7921 = 89²).

The spelling of 6991930 in words is "six million, nine hundred ninety-one thousand, nine hundred thirty".