649783 has 2 divisors, whose sum is σ = 649784. Its totient is φ = 649782.

The previous prime is 649777. The next prime is 649787. The reversal of 649783 is 387946.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 649783 - 2⁵ = 649751 is a prime.

It is a d-powerful number, because it can be written as 6² + 4³ + 7⁶ + 9² + 8³ + 3¹² .

649783 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324891 + 324892.

It is an arithmetic number, because the mean of its divisors is an integer number (324892).

2⁶⁴⁹⁷⁸³ is an apocalyptic number.

649783 is a deficient number, since it is larger than the sum of its proper divisors (1).

649783 is an equidigital number, since it uses as much as digits as its factorization.

649783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 649783 is about 806.0911859089. The cubic root of 649783 is about 86.6142697747.

The spelling of 649783 in words is "six hundred forty-nine thousand, seven hundred eighty-three".