18749863 has 16 divisors (see below), whose sum is σ = 21578400. Its totient is φ = 16132480.

The previous prime is 18749803. The next prime is 18749867. The reversal of 18749863 is 36894781.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18749863 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 (18749867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16353 + ... + 17461.

It is an arithmetic number, because the mean of its divisors is an integer number (1348650).

Almost surely, 2^18749863 is an apocalyptic number.

18749863 is a deficient number, since it is larger than the sum of its proper divisors (2828537).

18749863 is a wasteful number, since it uses less digits than its factorization.

18749863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202.

The product of its digits is 290304, while the sum is 46.

The square root of 18749863 is about 4330.1111994959. Note that the first 4 decimals coincide. The cubic root of 18749863 is about 265.6639952531.

The spelling of 18749863 in words is "eighteen million, seven hundred forty-nine thousand, eight hundred sixty-three".