647853 has 8 divisors (see below), whose sum is σ = 914688. Its totient is φ = 406464.

The previous prime is 647851. The next prime is 647861. The reversal of 647853 is 358746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 647853 - 2¹ = 647851 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 6⁴ + 4⁸ + 8⁵ + 7⁵ + 5 + 3¹² .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647851) 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 7 ways as a sum of consecutive naturals, for example, 6301 + ... + 6402.

It is an arithmetic number, because the mean of its divisors is an integer number (114336).

2⁶⁴⁷⁸⁵³ is an apocalyptic number.

It is an amenable number.

647853 is a deficient number, since it is larger than the sum of its proper divisors (266835).

647853 is a wasteful number, since it uses less digits than its factorization.

647853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12723.

The product of its digits is 20160, while the sum is 33.

The square root of 647853 is about 804.8931606120. The cubic root of 647853 is about 86.5284301839.

The spelling of 647853 in words is "six hundred forty-seven thousand, eight hundred fifty-three".