656863 has 4 divisors (see below), whose sum is σ = 695520. Its totient is φ = 618208.

The previous prime is 656839. The next prime is 656891. The reversal of 656863 is 368656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 656863 - 2¹³ = 648671 is a prime.

It is a Duffinian number.

656863 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656833) 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, 19303 + ... + 19336.

It is an arithmetic number, because the mean of its divisors is an integer number (173880).

2⁶⁵⁶⁸⁶³ is an apocalyptic number.

656863 is a deficient number, since it is larger than the sum of its proper divisors (38657).

656863 is a wasteful number, since it uses less digits than its factorization.

656863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38656.

The product of its digits is 25920, while the sum is 34.

The square root of 656863 is about 810.4708508022. The cubic root of 656863 is about 86.9277155345.

The spelling of 656863 in words is "six hundred fifty-six thousand, eight hundred sixty-three".