647747 has 2 divisors, whose sum is σ = 647748. Its totient is φ = 647746.

The previous prime is 647743. The next prime is 647753. The reversal of 647747 is 747746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647747 - 2² = 647743 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (647741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323873 + 323874.

It is an arithmetic number, because the mean of its divisors is an integer number (323874).

2⁶⁴⁷⁷⁴⁷ is an apocalyptic number.

647747 is a deficient number, since it is larger than the sum of its proper divisors (1).

647747 is an equidigital number, since it uses as much as digits as its factorization.

647747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32928, while the sum is 35.

The square root of 647747 is about 804.8273106698. The cubic root of 647747 is about 86.5237107419.

Subtracting 647747 from its reverse (747746), we obtain a palindrome (99999).

The spelling of 647747 in words is "six hundred forty-seven thousand, seven hundred forty-seven".