1998465056 has 72 divisors (see below), whose sum is σ = 4776762816. Its totient is φ = 806077440.

The previous prime is 1998465043. The next prime is 1998465059. The reversal of 1998465056 is 6505648991.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1998464989 and 1998465007.

It is not an unprimeable number, because it can be changed into a prime (1998465059) 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 11 ways as a sum of consecutive naturals, for example, 49301 + ... + 80171.

It is an arithmetic number, because the mean of its divisors is an integer number (66343928).

Almost surely, 2^1998465056 is an apocalyptic number.

1998465056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1998465056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2388381408).

1998465056 is an abundant number, since it is smaller than the sum of its proper divisors (2778297760).

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

1998465056 is a wasteful number, since it uses less digits than its factorization.

1998465056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30922 (or 30897 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 53.

The square root of 1998465056 is about 44704.1950604191. The cubic root of 1998465056 is about 1259.5986493603.

The spelling of 1998465056 in words is "one billion, nine hundred ninety-eight million, four hundred sixty-five thousand, fifty-six".