1863398563 has 6 divisors (see below), whose sum is σ = 2017763124. Its totient is φ = 1720060056.

The previous prime is 1863398549. The next prime is 1863398569. The reversal of 1863398563 is 3658933681.

It is a de Polignac number, because none of the positive numbers 2^k-1863398563 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1863398563.

It is not an unprimeable number, because it can be changed into a prime (1863398569) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5512845 + ... + 5513182.

It is an arithmetic number, because the mean of its divisors is an integer number (336293854).

Almost surely, 2^1863398563 is an apocalyptic number.

1863398563 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1863398563 is a deficient number, since it is larger than the sum of its proper divisors (154364561).

1863398563 is a wasteful number, since it uses less digits than its factorization.

1863398563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11026053 (or 11026040 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 52.

The square root of 1863398563 is about 43167.1004701497. The cubic root of 1863398563 is about 1230.5575199660.

The spelling of 1863398563 in words is "one billion, eight hundred sixty-three million, three hundred ninety-eight thousand, five hundred sixty-three".