1998599436 has 36 divisors (see below), whose sum is σ = 5317912600. Its totient is φ = 631136448.

The previous prime is 1998599423. The next prime is 1998599483. The reversal of 1998599436 is 6349958991.

1998599436 is a `hidden beast` number, since 1 + 9 + 9 + 8 + 599 + 4 + 36 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

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, 1460281 + ... + 1461648.

Almost surely, 2^1998599436 is an apocalyptic number.

It is an amenable number.

1998599436 is an abundant number, since it is smaller than the sum of its proper divisors (3319313164).

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

1998599436 is a wasteful number, since it uses less digits than its factorization.

1998599436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2921958 (or 2921953 counting only the distinct ones).

The product of its digits is 18895680, while the sum is 63.

The square root of 1998599436 is about 44705.6980260906. The cubic root of 1998599436 is about 1259.6268812063.

The spelling of 1998599436 in words is "one billion, nine hundred ninety-eight million, five hundred ninety-nine thousand, four hundred thirty-six".