1998377056 has 96 divisors (see below), whose sum is σ = 4428684288. Its totient is φ = 881349120.

The previous prime is 1998377027. The next prime is 1998377077. The reversal of 1998377056 is 6507738991.

It is a junction number, because it is equal to n+sod(n) for n = 1998376988 and 1998377006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1069435 + ... + 1071301.

It is an arithmetic number, because the mean of its divisors is an integer number (46132128).

Almost surely, 2^1998377056 is an apocalyptic number.

1998377056 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 1998377056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2214342144).

1998377056 is an abundant number, since it is smaller than the sum of its proper divisors (2430307232).

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

1998377056 is a wasteful number, since it uses less digits than its factorization.

1998377056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2004 (or 1996 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 55.

The square root of 1998377056 is about 44703.2108019100. The cubic root of 1998377056 is about 1259.5801607862.

The spelling of 1998377056 in words is "one billion, nine hundred ninety-eight million, three hundred seventy-seven thousand, fifty-six".