6821992 has 8 divisors (see below), whose sum is σ = 12791250. Its totient is φ = 3410992.

The previous prime is 6821963. The next prime is 6822017. The reversal of 6821992 is 2991286.

It can be written as a sum of positive squares in only one way, i.e., 4553956 + 2268036 = 2134^2 + 1506^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 426367 + ... + 426382.

Almost surely, 2^6821992 is an apocalyptic number.

It is an amenable number.

6821992 is a deficient number, since it is larger than the sum of its proper divisors (5969258).

6821992 is a wasteful number, since it uses less digits than its factorization.

6821992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852755 (or 852751 counting only the distinct ones).

The product of its digits is 15552, while the sum is 37.

The square root of 6821992 is about 2611.8943317064. The cubic root of 6821992 is about 189.6576661164.

The spelling of 6821992 in words is "six million, eight hundred twenty-one thousand, nine hundred ninety-two".