6721723 has 2 divisors, whose sum is σ = 6721724. Its totient is φ = 6721722.

The previous prime is 6721711. The next prime is 6721733. The reversal of 6721723 is 3271276.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6721723 - 2⁵ = 6721691 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6721691 and 6721700.

It is not a weakly prime, because it can be changed into another prime (6721733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360861 + 3360862.

It is an arithmetic number, because the mean of its divisors is an integer number (3360862).

Almost surely, 2^6721723 is an apocalyptic number.

6721723 is a deficient number, since it is larger than the sum of its proper divisors (1).

6721723 is an equidigital number, since it uses as much as digits as its factorization.

6721723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 28.

The square root of 6721723 is about 2592.6285889035. The cubic root of 6721723 is about 188.7238859827.

Adding to 6721723 its reverse (3271276), we get a palindrome (9992999).

The spelling of 6721723 in words is "six million, seven hundred twenty-one thousand, seven hundred twenty-three".