6721943 has 2 divisors, whose sum is σ = 6721944. Its totient is φ = 6721942.

The previous prime is 6721927. The next prime is 6721951. The reversal of 6721943 is 3491276.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6721943 - 2⁴ = 6721927 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6721973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360971 + 3360972.

It is an arithmetic number, because the mean of its divisors is an integer number (3360972).

Almost surely, 2^6721943 is an apocalyptic number.

6721943 is a deficient number, since it is larger than the sum of its proper divisors (1).

6721943 is an equidigital number, since it uses as much as digits as its factorization.

6721943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 32.

The square root of 6721943 is about 2592.6710165387. The cubic root of 6721943 is about 188.7259449192.

The spelling of 6721943 in words is "six million, seven hundred twenty-one thousand, nine hundred forty-three".