1992104689 has 3 divisors (see below), whose sum is σ = 1992149323. Its totient is φ = 1992060056.

The previous prime is 1992104687. The next prime is 1992104701. The reversal of 1992104689 is 9864012991.

It is a happy number.

The square root of 1992104689 is 44633.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1755191025 + 236913664 = 41895^2 + 15392^2 .

It is not a de Polignac number, because 1992104689 - 2¹ = 1992104687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1992104687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 22317 + ... + 66949.

Almost surely, 2^1992104689 is an apocalyptic number.

1992104689 is the 44633-rd square number.

1992104689 is the 22317-th centered octagonal number.

It is an amenable number.

1992104689 is a deficient number, since it is larger than the sum of its proper divisors (44634).

1992104689 is an frugal number, since it uses more digits than its factorization.

1992104689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89266 (or 44633 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 49.

The cubic root of 1992104689 is about 1258.2609520559.

Multiplying 1992104689 by its sum of digits (49), we get a square (97613129761 = 312431²).

The spelling of 1992104689 in words is "one billion, nine hundred ninety-two million, one hundred four thousand, six hundred eighty-nine".