1988559912 has 64 divisors (see below), whose sum is σ = 5284987200. Its totient is φ = 621734400.

The previous prime is 1988559871. The next prime is 1988559913. The reversal of 1988559912 is 2199558891.

It is a super-2 number, since 2×1988559912² = 7908741047226895488, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (1988559913) 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, 24468 + ... + 67644.

It is an arithmetic number, because the mean of its divisors is an integer number (82577925).

Almost surely, 2^1988559912 is an apocalyptic number.

1988559912 is a gapful number since it is divisible by the number (12) 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 1988559912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2642493600).

1988559912 is an abundant number, since it is smaller than the sum of its proper divisors (3296427288).

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

1988559912 is a wasteful number, since it uses less digits than its factorization.

1988559912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43306 (or 43302 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 57.

The square root of 1988559912 is about 44593.2720485950. The cubic root of 1988559912 is about 1257.5141869769.

It can be divided in two parts, 19885 and 59912, that added together give a palindrome (79797).

The spelling of 1988559912 in words is "one billion, nine hundred eighty-eight million, five hundred fifty-nine thousand, nine hundred twelve".