19798218 has 24 divisors (see below), whose sum is σ = 46796256. Its totient is φ = 5999400.

The previous prime is 19798201. The next prime is 19798223. The reversal of 19798218 is 81289791.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49798 + ... + 50193.

It is an arithmetic number, because the mean of its divisors is an integer number (1949844).

Almost surely, 2^19798218 is an apocalyptic number.

19798218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19798218 is an abundant number, since it is smaller than the sum of its proper divisors (26998038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19798218 is a wasteful number, since it uses less digits than its factorization.

19798218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100010 (or 100007 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The square root of 19798218 is about 4449.5188503927. The cubic root of 19798218 is about 270.5258066383.

The spelling of 19798218 in words is "nineteen million, seven hundred ninety-eight thousand, two hundred eighteen".