863861812 has 12 divisors (see below), whose sum is σ = 1649190816. Its totient is φ = 392664440.

The previous prime is 863861729. The next prime is 863861813. The reversal of 863861812 is 218168368.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863861813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9816568 + ... + 9816655.

It is an arithmetic number, because the mean of its divisors is an integer number (137432568).

Almost surely, 2^863861812 is an apocalyptic number.

It is an amenable number.

863861812 is a deficient number, since it is larger than the sum of its proper divisors (785329004).

863861812 is a wasteful number, since it uses less digits than its factorization.

863861812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19633238 (or 19633236 counting only the distinct ones).

The product of its digits is 110592, while the sum is 43.

The square root of 863861812 is about 29391.5261937859. The cubic root of 863861812 is about 952.3898507475.

The spelling of 863861812 in words is "eight hundred sixty-three million, eight hundred sixty-one thousand, eight hundred twelve".