1998961038 has 128 divisors (see below), whose sum is σ = 4767206400. Its totient is φ = 619871616.

The previous prime is 1998961037. The next prime is 1998961057. The reversal of 1998961038 is 8301698991.

1998961038 is a `hidden beast` number, since 19 + 9 + 8 + 9 + 610 + 3 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

1998961038 is a modest number, since divided by 961038 gives 1998 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998961037) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4553223 + ... + 4553661.

It is an arithmetic number, because the mean of its divisors is an integer number (37243800).

Almost surely, 2^1998961038 is an apocalyptic number.

1998961038 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1998961038, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2383603200).

1998961038 is an abundant number, since it is smaller than the sum of its proper divisors (2768245362).

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

1998961038 is a wasteful number, since it uses less digits than its factorization.

1998961038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 577 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 54.

The square root of 1998961038 is about 44709.7420927475. The cubic root of 1998961038 is about 1259.7028437569.

The spelling of 1998961038 in words is "one billion, nine hundred ninety-eight million, nine hundred sixty-one thousand, thirty-eight".