19718898 has 16 divisors (see below), whose sum is σ = 40798080. Its totient is φ = 6346256.

The previous prime is 19718879. The next prime is 19718899. The reversal of 19718898 is 89881791.

It is a self number, because there is not a number n which added to its sum of digits gives 19718898.

It is not an unprimeable number, because it can be changed into a prime (19718899) 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, 56490 + ... + 56837.

It is an arithmetic number, because the mean of its divisors is an integer number (2549880).

Almost surely, 2^19718898 is an apocalyptic number.

19718898 is an abundant number, since it is smaller than the sum of its proper divisors (21079182).

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

19718898 is a wasteful number, since it uses less digits than its factorization.

19718898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113361.

The product of its digits is 290304, while the sum is 51.

The square root of 19718898 is about 4440.5965815417. The cubic root of 19718898 is about 270.1640429740.

The spelling of 19718898 in words is "nineteen million, seven hundred eighteen thousand, eight hundred ninety-eight".