647723 has 2 divisors, whose sum is σ = 647724. Its totient is φ = 647722.

The previous prime is 647719. The next prime is 647741. The reversal of 647723 is 327746.

647723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647723 - 2² = 647719 is a prime.

It is a Sophie Germain prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647723.

It is not a weakly prime, because it can be changed into another prime (647743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323861 + 323862.

It is an arithmetic number, because the mean of its divisors is an integer number (323862).

2⁶⁴⁷⁷²³ is an apocalyptic number.

647723 is a deficient number, since it is larger than the sum of its proper divisors (1).

647723 is an equidigital number, since it uses as much as digits as its factorization.

647723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 29.

The square root of 647723 is about 804.8124005009. The cubic root of 647723 is about 86.5226421175.

The spelling of 647723 in words is "six hundred forty-seven thousand, seven hundred twenty-three".