1989042608 has 20 divisors (see below), whose sum is σ = 4404308880. Its totient is φ = 852446784.

The previous prime is 1989042589. The next prime is 1989042623. The reversal of 1989042608 is 8062409891.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8879543 + ... + 8879766.

It is an arithmetic number, because the mean of its divisors is an integer number (220215444).

Almost surely, 2^1989042608 is an apocalyptic number.

It is an amenable number.

1989042608 is an abundant number, since it is smaller than the sum of its proper divisors (2415266272).

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

1989042608 is a wasteful number, since it uses less digits than its factorization.

1989042608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17759324 (or 17759318 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 47.

The square root of 1989042608 is about 44598.6839267708. The cubic root of 1989042608 is about 1257.6159269274.

The spelling of 1989042608 in words is "one billion, nine hundred eighty-nine million, forty-two thousand, six hundred eight".