649843 has 2 divisors, whose sum is σ = 649844. Its totient is φ = 649842.

The previous prime is 649829. The next prime is 649849. The reversal of 649843 is 348946.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 649799 and 649808.

It is not a weakly prime, because it can be changed into another prime (649849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324921 + 324922.

It is an arithmetic number, because the mean of its divisors is an integer number (324922).

2⁶⁴⁹⁸⁴³ is an apocalyptic number.

649843 is a deficient number, since it is larger than the sum of its proper divisors (1).

649843 is an equidigital number, since it uses as much as digits as its factorization.

649843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 34.

The square root of 649843 is about 806.1284016830. The cubic root of 649843 is about 86.6169356371.

The spelling of 649843 in words is "six hundred forty-nine thousand, eight hundred forty-three".