863861143 has 4 divisors (see below), whose sum is σ = 866140840. Its totient is φ = 861581448.

The previous prime is 863861111. The next prime is 863861147. The reversal of 863861143 is 341168368.

It is a happy number.

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 863861143 - 2⁵ = 863861111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 863861096 and 863861105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863861147) 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, 1139280 + ... + 1140037.

It is an arithmetic number, because the mean of its divisors is an integer number (216535210).

Almost surely, 2^863861143 is an apocalyptic number.

863861143 is a deficient number, since it is larger than the sum of its proper divisors (2279697).

863861143 is a wasteful number, since it uses less digits than its factorization.

863861143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2279696.

The product of its digits is 82944, while the sum is 40.

The square root of 863861143 is about 29391.5148129524. The cubic root of 863861143 is about 952.3896048945.

The spelling of 863861143 in words is "eight hundred sixty-three million, eight hundred sixty-one thousand, one hundred forty-three".