1998411888 has 80 divisors (see below), whose sum is σ = 5647781376. Its totient is φ = 603870720.

The previous prime is 1998411839. The next prime is 1998411889. The reversal of 1998411888 is 8881148991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998411889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188620 + ... + 198932.

Almost surely, 2^1998411888 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 1998411888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2823890688).

1998411888 is an abundant number, since it is smaller than the sum of its proper divisors (3649369488).

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

1998411888 is a wasteful number, since it uses less digits than its factorization.

1998411888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10702 (or 10696 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 57.

The square root of 1998411888 is about 44703.6003919147. The cubic root of 1998411888 is about 1259.5874789649.

The spelling of 1998411888 in words is "one billion, nine hundred ninety-eight million, four hundred eleven thousand, eight hundred eighty-eight".