863981389812 has 24 divisors (see below), whose sum is σ = 2028324412576. Its totient is φ = 286226962848.

The previous prime is 863981389783. The next prime is 863981389837. The reversal of 863981389812 is 218983189368.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220852183 + ... + 220856094.

Almost surely, 2^863981389812 is an apocalyptic number.

It is an amenable number.

863981389812 is an abundant number, since it is smaller than the sum of its proper divisors (1164343022764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

863981389812 is a wasteful number, since it uses less digits than its factorization.

863981389812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441708447 (or 441708445 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 66.

The spelling of 863981389812 in words is "eight hundred sixty-three billion, nine hundred eighty-one million, three hundred eighty-nine thousand, eight hundred twelve".