19868863 has 6 divisors (see below), whose sum is σ = 23112816. Its totient is φ = 17030412.

The previous prime is 19868839. The next prime is 19868867. The reversal of 19868863 is 36886891.

It is not a de Polignac number, because 19868863 - 2⁹ = 19868351 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 405487 = 19868863 / (1 + 9 + 8 + 6 + 8 + 8 + 6 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19868867) 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, 202695 + ... + 202792.

It is an arithmetic number, because the mean of its divisors is an integer number (3852136).

Almost surely, 2^19868863 is an apocalyptic number.

19868863 is a deficient number, since it is larger than the sum of its proper divisors (3243953).

19868863 is an equidigital number, since it uses as much as digits as its factorization.

19868863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405501 (or 405494 counting only the distinct ones).

The product of its digits is 497664, while the sum is 49.

The square root of 19868863 is about 4457.4502801490. The cubic root of 19868863 is about 270.8471926215.

The spelling of 19868863 in words is "nineteen million, eight hundred sixty-eight thousand, eight hundred sixty-three".