6721933 has 4 divisors (see below), whose sum is σ = 6732540. Its totient is φ = 6711328.

The previous prime is 6721927. The next prime is 6721943. The reversal of 6721933 is 3391276.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4656964 + 2064969 = 2158^2 + 1437^2 .

It is a cyclic number.

It is not a de Polignac number, because 6721933 - 2¹³ = 6713741 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6721895 and 6721904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721943) 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 3 ways as a sum of consecutive naturals, for example, 4288 + ... + 5641.

It is an arithmetic number, because the mean of its divisors is an integer number (1683135).

Almost surely, 2^6721933 is an apocalyptic number.

It is an amenable number.

6721933 is a deficient number, since it is larger than the sum of its proper divisors (10607).

6721933 is an equidigital number, since it uses as much as digits as its factorization.

6721933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10606.

The product of its digits is 6804, while the sum is 31.

The square root of 6721933 is about 2592.6690880249. The cubic root of 6721933 is about 188.7258513321.

The spelling of 6721933 in words is "six million, seven hundred twenty-one thousand, nine hundred thirty-three".