649841 has 4 divisors (see below), whose sum is σ = 652800. Its totient is φ = 646884.

The previous prime is 649829. The next prime is 649843. The reversal of 649841 is 148946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 649841 - 2⁶ = 649777 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 649798 and 649807.

It is not an unprimeable number, because it can be changed into a prime (649843) 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 in 3 ways as a sum of consecutive naturals, for example, 1121 + ... + 1598.

It is an arithmetic number, because the mean of its divisors is an integer number (163200).

2⁶⁴⁹⁸⁴¹ is an apocalyptic number.

It is an amenable number.

649841 is a deficient number, since it is larger than the sum of its proper divisors (2959).

649841 is a wasteful number, since it uses less digits than its factorization.

649841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2958.

The product of its digits is 6912, while the sum is 32.

The square root of 649841 is about 806.1271611849. The cubic root of 649841 is about 86.6168467777.

The spelling of 649841 in words is "six hundred forty-nine thousand, eight hundred forty-one".