1988996022 has 144 divisors (see below), whose sum is σ = 5112761472. Its totient is φ = 553029120.

The previous prime is 1988995999. The next prime is 1988996027. The reversal of 1988996022 is 2206998891.

It is a super-2 number, since 2×1988996022² = 7912210351063648968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1988996022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988996027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 15661323 + ... + 15661449.

It is an arithmetic number, because the mean of its divisors is an integer number (35505288).

Almost surely, 2^1988996022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1988996022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2556380736).

1988996022 is an abundant number, since it is smaller than the sum of its proper divisors (3123765450).

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

1988996022 is a wasteful number, since it uses less digits than its factorization.

1988996022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323 (or 193 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The square root of 1988996022 is about 44598.1616437270. The cubic root of 1988996022 is about 1257.6061085098.

The spelling of 1988996022 in words is "one billion, nine hundred eighty-eight million, nine hundred ninety-six thousand, twenty-two".