647489 has 2 divisors, whose sum is σ = 647490. Its totient is φ = 647488.

The previous prime is 647477. The next prime is 647503. The reversal of 647489 is 984746.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 350464 + 297025 = 592^2 + 545^2 .

It is a cyclic number.

It is not a de Polignac number, because 647489 - 2¹⁶ = 581953 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (647429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323744 + 323745.

It is an arithmetic number, because the mean of its divisors is an integer number (323745).

2⁶⁴⁷⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

647489 is a deficient number, since it is larger than the sum of its proper divisors (1).

647489 is an equidigital number, since it uses as much as digits as its factorization.

647489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The square root of 647489 is about 804.6670118751. The cubic root of 647489 is about 86.5122216462.

The spelling of 647489 in words is "six hundred forty-seven thousand, four hundred eighty-nine".