1998561152 has 64 divisors (see below), whose sum is σ = 4585299840. Its totient is φ = 849937920.

The previous prime is 1998561139. The next prime is 1998561163. The reversal of 1998561152 is 2511658991.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 1998561097 and 1998561106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108863 + ... + 125889.

It is an arithmetic number, because the mean of its divisors is an integer number (71645310).

Almost surely, 2^1998561152 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1998561152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2292649920).

1998561152 is an abundant number, since it is smaller than the sum of its proper divisors (2586738688).

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

1998561152 is a wasteful number, since it uses less digits than its factorization.

1998561152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17179 (or 17167 counting only the distinct ones).

The product of its digits is 194400, while the sum is 47.

The square root of 1998561152 is about 44705.2698459589. The cubic root of 1998561152 is about 1259.6188382634.

The spelling of 1998561152 in words is "one billion, nine hundred ninety-eight million, five hundred sixty-one thousand, one hundred fifty-two".