1998351936 has 168 divisors, whose sum is σ = 6607698240. Its totient is φ = 565595136.

The previous prime is 1998351919. The next prime is 1998351947. The reversal of 1998351936 is 6391538991.

1998351936 is a `hidden beast` number, since 1 + 9 + 98 + 3 + 519 + 36 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is a super-2 number, since 2×1998351936² = 7986820920229896192, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 437215 + ... + 441761.

Almost surely, 2^1998351936 is an apocalyptic number.

1998351936 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 1998351936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3303849120).

1998351936 is an abundant number, since it is smaller than the sum of its proper divisors (4609346304).

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

1998351936 is a wasteful number, since it uses less digits than its factorization.

1998351936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4681 (or 4668 counting only the distinct ones).

The product of its digits is 1574640, while the sum is 54.

The square root of 1998351936 is about 44702.9298368686. The cubic root of 1998351936 is about 1259.5748830391.

The spelling of 1998351936 in words is "one billion, nine hundred ninety-eight million, three hundred fifty-one thousand, nine hundred thirty-six".