1989008143684 has 9 divisors (see below), whose sum is σ = 3480769187581. Its totient is φ = 994502661520.

The previous prime is 1989008143621. The next prime is 1989008143699. The reversal of 1989008143684 is 4863418009891.

The square root of 1989008143684 is 1410322.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1636552201284 + 352455942400 = 1279278^2 + 593680^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2468064 + ... + 3173224.

Almost surely, 2^{1989008143684} is an apocalyptic number.

1989008143684 is the 1410322-nd square number.

It is an amenable number.

1989008143684 is a deficient number, since it is larger than the sum of its proper divisors (1491761043897).

1989008143684 is an frugal number, since it uses more digits than its factorization.

1989008143684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410326 (or 705163 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 61.

The spelling of 1989008143684 in words is "one trillion, nine hundred eighty-nine billion, eight million, one hundred forty-three thousand, six hundred eighty-four".