863981287 has 8 divisors (see below), whose sum is σ = 937545840. Its totient is φ = 791431680.

The previous prime is 863981273. The next prime is 863981299. The reversal of 863981287 is 782189368.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 863981287 - 2¹⁹ = 863456999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863981227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251962 + ... + 255367.

It is an arithmetic number, because the mean of its divisors is an integer number (117193230).

Almost surely, 2^863981287 is an apocalyptic number.

863981287 is a deficient number, since it is larger than the sum of its proper divisors (73564553).

863981287 is a wasteful number, since it uses less digits than its factorization.

863981287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507473.

The product of its digits is 1161216, while the sum is 52.

The square root of 863981287 is about 29393.5585970804. The cubic root of 863981287 is about 952.4337549656.

The spelling of 863981287 in words is "eight hundred sixty-three million, nine hundred eighty-one thousand, two hundred eighty-seven".