1992643844 has 6 divisors (see below), whose sum is σ = 3487126734. Its totient is φ = 996321920.

The previous prime is 1992643841. The next prime is 1992643879. The reversal of 1992643844 is 4483462991.

It can be written as a sum of positive squares in only one way, i.e., 1801153600 + 191490244 = 42440^2 + 13838^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1992643792 and 1992643801.

It is not an unprimeable number, because it can be changed into a prime (1992643841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249080477 + ... + 249080484.

It is an arithmetic number, because the mean of its divisors is an integer number (581187789).

Almost surely, 2^1992643844 is an apocalyptic number.

It is an amenable number.

1992643844 is a deficient number, since it is larger than the sum of its proper divisors (1494482890).

1992643844 is a wasteful number, since it uses less digits than its factorization.

1992643844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498160965 (or 498160963 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 50.

The square root of 1992643844 is about 44639.0394609920. The cubic root of 1992643844 is about 1258.3744562130.

The spelling of 1992643844 in words is "one billion, nine hundred ninety-two million, six hundred forty-three thousand, eight hundred forty-four".