863806646 has 16 divisors (see below), whose sum is σ = 1312784064. Its totient is φ = 426249024.

The previous prime is 863806639. The next prime is 863806651. The reversal of 863806646 is 646608368.

It is a self number, because there is not a number n which added to its sum of digits gives 863806646.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38291 + ... + 56513.

It is an arithmetic number, because the mean of its divisors is an integer number (82049004).

Almost surely, 2^863806646 is an apocalyptic number.

863806646 is a deficient number, since it is larger than the sum of its proper divisors (448977418).

863806646 is a wasteful number, since it uses less digits than its factorization.

863806646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18535.

The product of its (nonzero) digits is 995328, while the sum is 47.

The square root of 863806646 is about 29390.5877110343. The cubic root of 863806646 is about 952.3695771898.

The spelling of 863806646 in words is "eight hundred sixty-three million, eight hundred six thousand, six hundred forty-six".