1989195920 has 40 divisors (see below), whose sum is σ = 4661320704. Its totient is φ = 789409152.

The previous prime is 1989195913. The next prime is 1989195931. The reversal of 1989195920 is 295919891.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87734 + ... + 108053.

Almost surely, 2^1989195920 is an apocalyptic number.

1989195920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1989195920 is an abundant number, since it is smaller than the sum of its proper divisors (2672124784).

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

1989195920 is a wasteful number, since it uses less digits than its factorization.

1989195920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195927 (or 195921 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 53.

The square root of 1989195920 is about 44600.4026887650. The cubic root of 1989195920 is about 1257.6482377250.

The spelling of 1989195920 in words is "one billion, nine hundred eighty-nine million, one hundred ninety-five thousand, nine hundred twenty".