1998217396 has 24 divisors (see below), whose sum is σ = 4089377600. Its totient is φ = 836462592.

The previous prime is 1998217381. The next prime is 1998217399. The reversal of 1998217396 is 6937128991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998217399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 828621 + ... + 831028.

Almost surely, 2^1998217396 is an apocalyptic number.

It is an amenable number.

1998217396 is an abundant number, since it is smaller than the sum of its proper divisors (2091160204).

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

1998217396 is a wasteful number, since it uses less digits than its factorization.

1998217396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1659703 (or 1659701 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 55.

The square root of 1998217396 is about 44701.4249884721. The cubic root of 1998217396 is about 1259.5466152442.

The spelling of 1998217396 in words is "one billion, nine hundred ninety-eight million, two hundred seventeen thousand, three hundred ninety-six".