18819851 has 8 divisors (see below), whose sum is σ = 19225440. Its totient is φ = 18418752.

The previous prime is 18819847. The next prime is 18819859. The reversal of 18819851 is 15891881.

It is a happy number.

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 18819851 - 2² = 18819847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18819799 and 18819808.

It is not an unprimeable number, because it can be changed into a prime (18819859) 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 7 ways as a sum of consecutive naturals, for example, 8141 + ... + 10193.

It is an arithmetic number, because the mean of its divisors is an integer number (2403180).

Almost surely, 2^18819851 is an apocalyptic number.

18819851 is a deficient number, since it is larger than the sum of its proper divisors (405589).

18819851 is a wasteful number, since it uses less digits than its factorization.

18819851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2245.

The product of its digits is 23040, while the sum is 41.

The square root of 18819851 is about 4338.1852196512. The cubic root of 18819851 is about 265.9941346437.

The spelling of 18819851 in words is "eighteen million, eight hundred nineteen thousand, eight hundred fifty-one".