649853 has 4 divisors (see below), whose sum is σ = 670848. Its totient is φ = 628860.

The previous prime is 649849. The next prime is 649867. The reversal of 649853 is 358946.

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 649853 - 2² = 649849 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10451 + ... + 10512.

It is an arithmetic number, because the mean of its divisors is an integer number (167712).

2⁶⁴⁹⁸⁵³ is an apocalyptic number.

It is an amenable number.

649853 is a deficient number, since it is larger than the sum of its proper divisors (20995).

649853 is a wasteful number, since it uses less digits than its factorization.

649853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20994.

The product of its digits is 25920, while the sum is 35.

The square root of 649853 is about 806.1346041450. The cubic root of 649853 is about 86.6173799316.

The spelling of 649853 in words is "six hundred forty-nine thousand, eight hundred fifty-three".