1988921212 has 12 divisors (see below), whose sum is σ = 3489562440. Its totient is φ = 991903376.

The previous prime is 1988921203. The next prime is 1988921257. The reversal of 1988921212 is 2121298891.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637558 + ... + 640669.

It is an arithmetic number, because the mean of its divisors is an integer number (290796870).

Almost surely, 2^1988921212 is an apocalyptic number.

It is an amenable number.

1988921212 is a deficient number, since it is larger than the sum of its proper divisors (1500641228).

1988921212 is a wasteful number, since it uses less digits than its factorization.

1988921212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278620 (or 1278618 counting only the distinct ones).

The product of its digits is 41472, while the sum is 43.

The square root of 1988921212 is about 44597.3229241397. The cubic root of 1988921212 is about 1257.5903413101.

The spelling of 1988921212 in words is "one billion, nine hundred eighty-eight million, nine hundred twenty-one thousand, two hundred twelve".