1989226988 has 24 divisors (see below), whose sum is σ = 3991022112. Its totient is φ = 849832704.

The previous prime is 1989226973. The next prime is 1989226997. The reversal of 1989226988 is 8896229891.

It is a self number, because there is not a number n which added to its sum of digits gives 1989226988.

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, 103181 + ... + 120932.

It is an arithmetic number, because the mean of its divisors is an integer number (166292588).

Almost surely, 2^1989226988 is an apocalyptic number.

It is an amenable number.

1989226988 is an abundant number, since it is smaller than the sum of its proper divisors (2001795124).

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

1989226988 is a wasteful number, since it uses less digits than its factorization.

1989226988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224441 (or 224439 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 62.

The square root of 1989226988 is about 44600.7509802245. The cubic root of 1989226988 is about 1257.6547851632.

The spelling of 1989226988 in words is "one billion, nine hundred eighty-nine million, two hundred twenty-six thousand, nine hundred eighty-eight".