647293 has 2 divisors, whose sum is σ = 647294. Its totient is φ = 647292.

The previous prime is 647263. The next prime is 647303. The reversal of 647293 is 392746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 515524 + 131769 = 718^2 + 363^2 .

It is a cyclic number.

It is not a de Polignac number, because 647293 - 2⁵ = 647261 is a prime.

647293 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323646 + 323647.

It is an arithmetic number, because the mean of its divisors is an integer number (323647).

2⁶⁴⁷²⁹³ is an apocalyptic number.

It is an amenable number.

647293 is a deficient number, since it is larger than the sum of its proper divisors (1).

647293 is an equidigital number, since it uses as much as digits as its factorization.

647293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 31.

The square root of 647293 is about 804.5452131484. The cubic root of 647293 is about 86.5034914558.

The spelling of 647293 in words is "six hundred forty-seven thousand, two hundred ninety-three".