1000863887 has 4 divisors (see below), whose sum is σ = 1001451240. Its totient is φ = 1000276536.

The previous prime is 1000863881. The next prime is 1000863907. The reversal of 1000863887 is 7883680001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7883680001 = 317 ⋅24869653.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1000863887 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 (1000863881) 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, 291113 + ... + 294530.

It is an arithmetic number, because the mean of its divisors is an integer number (250362810).

Almost surely, 2^1000863887 is an apocalyptic number.

1000863887 is a deficient number, since it is larger than the sum of its proper divisors (587353).

1000863887 is an equidigital number, since it uses as much as digits as its factorization.

1000863887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587352.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 1000863887 is about 31636.4329057497. The cubic root of 1000863887 is about 1000.2878794508.

The spelling of 1000863887 in words is "one billion, eight hundred sixty-three thousand, eight hundred eighty-seven".