18816863 has 8 divisors (see below), whose sum is σ = 20319600. Its totient is φ = 17322048.

The previous prime is 18816851. The next prime is 18816869. The reversal of 18816863 is 36861881.

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

It is a cyclic number.

It is not a de Polignac number, because 18816863 - 2¹⁴ = 18800479 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18816863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18816869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3548 + ... + 7086.

It is an arithmetic number, because the mean of its divisors is an integer number (2539950).

Almost surely, 2^18816863 is an apocalyptic number.

18816863 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18816863 is a deficient number, since it is larger than the sum of its proper divisors (1502737).

18816863 is a wasteful number, since it uses less digits than its factorization.

18816863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3961.

The product of its digits is 55296, while the sum is 41.

The square root of 18816863 is about 4337.8408223447. The cubic root of 18816863 is about 265.9800567331.

The spelling of 18816863 in words is "eighteen million, eight hundred sixteen thousand, eight hundred sixty-three".