649845 has 24 divisors (see below), whose sum is σ = 1287936. Its totient is φ = 296928.

The previous prime is 649843. The next prime is 649849. The reversal of 649845 is 548946.

649845 is a `hidden beast` number, since 649 + 8 + 4 + 5 = 666.

It is not a de Polignac number, because 649845 - 2¹ = 649843 is a prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649845.

It is not an unprimeable number, because it can be changed into a prime (649843) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 717 + ... + 1346.

It is an arithmetic number, because the mean of its divisors is an integer number (53664).

2⁶⁴⁹⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

649845 is a deficient number, since it is larger than the sum of its proper divisors (638091).

649845 is a wasteful number, since it uses less digits than its factorization.

649845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2081 (or 2078 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 649845 is about 806.1296421792. The cubic root of 649845 is about 86.6170244964.

The spelling of 649845 in words is "six hundred forty-nine thousand, eight hundred forty-five".