649867 has 2 divisors, whose sum is σ = 649868. Its totient is φ = 649866.

The previous prime is 649849. The next prime is 649871. The reversal of 649867 is 768946.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 649867 - 2⁷ = 649739 is a prime.

It is not a weakly prime, because it can be changed into another prime (649877) 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, 324933 + 324934.

It is an arithmetic number, because the mean of its divisors is an integer number (324934).

2⁶⁴⁹⁸⁶⁷ is an apocalyptic number.

649867 is a deficient number, since it is larger than the sum of its proper divisors (1).

649867 is an equidigital number, since it uses as much as digits as its factorization.

649867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 40.

The square root of 649867 is about 806.1432875116. The cubic root of 649867 is about 86.6180019362.

The spelling of 649867 in words is "six hundred forty-nine thousand, eight hundred sixty-seven".