647693 has 2 divisors, whose sum is σ = 647694. Its totient is φ = 647692.

The previous prime is 647687. The next prime is 647719. The reversal of 647693 is 396746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 643204 + 4489 = 802^2 + 67^2 .

It is a cyclic number.

It is not a de Polignac number, because 647693 - 2¹⁰ = 646669 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323846 + 323847.

It is an arithmetic number, because the mean of its divisors is an integer number (323847).

2⁶⁴⁷⁶⁹³ is an apocalyptic number.

It is an amenable number.

647693 is a deficient number, since it is larger than the sum of its proper divisors (1).

647693 is an equidigital number, since it uses as much as digits as its factorization.

647693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 35.

The square root of 647693 is about 804.7937624013. The cubic root of 647693 is about 86.5213062999.

The spelling of 647693 in words is "six hundred forty-seven thousand, six hundred ninety-three".