6921998 has 8 divisors (see below), whose sum is σ = 10559160. Its totient is φ = 3402280.

The previous prime is 6921961. The next prime is 6922001. The reversal of 6921998 is 8991296.

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

It is a Curzon number.

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, 29213 + ... + 29448.

It is an arithmetic number, because the mean of its divisors is an integer number (1319895).

Almost surely, 2^6921998 is an apocalyptic number.

6921998 is a deficient number, since it is larger than the sum of its proper divisors (3637162).

6921998 is a wasteful number, since it uses less digits than its factorization.

6921998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58722.

The product of its digits is 69984, while the sum is 44.

The square root of 6921998 is about 2630.9690230027. The cubic root of 6921998 is about 190.5799271021.

The spelling of 6921998 in words is "six million, nine hundred twenty-one thousand, nine hundred ninety-eight".