1998427216 has 20 divisors (see below), whose sum is σ = 3954336192. Its totient is φ = 977953376.

The previous prime is 1998427177. The next prime is 1998427219. The reversal of 1998427216 is 6127248991.

It is a super-2 number, since 2×1998427216² = 7987422675299021312, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1998427216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998427219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1327990 + ... + 1329493.

Almost surely, 2^1998427216 is an apocalyptic number.

1998427216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1998427216 is a deficient number, since it is larger than the sum of its proper divisors (1955908976).

1998427216 is a wasteful number, since it uses less digits than its factorization.

1998427216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2657538 (or 2657532 counting only the distinct ones).

The product of its digits is 435456, while the sum is 49.

The square root of 1998427216 is about 44703.7718319159. The cubic root of 1998427216 is about 1259.5906993400.

The spelling of 1998427216 in words is "one billion, nine hundred ninety-eight million, four hundred twenty-seven thousand, two hundred sixteen".