1989835920 has 60 divisors (see below), whose sum is σ = 6682534716. Its totient is φ = 530622720.

The previous prime is 1989835901. The next prime is 1989835943. The reversal of 1989835920 is 295389891.

It can be written as a sum of positive squares in 2 ways, for example, as 204604416 + 1785231504 = 14304^2 + 42252^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1381111 + ... + 1382550.

Almost surely, 2^1989835920 is an apocalyptic number.

1989835920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1989835920 is an abundant number, since it is smaller than the sum of its proper divisors (4692698796).

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

1989835920 is a wasteful number, since it uses less digits than its factorization.

1989835920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2763680 (or 2763671 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The square root of 1989835920 is about 44607.5769348661. The cubic root of 1989835920 is about 1257.7831010229.

The spelling of 1989835920 in words is "one billion, nine hundred eighty-nine million, eight hundred thirty-five thousand, nine hundred twenty".