1983790563 has 4 divisors (see below), whose sum is σ = 2645054088. Its totient is φ = 1322527040.

The previous prime is 1983790541. The next prime is 1983790573. The reversal of 1983790563 is 3650973891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1983790563 - 2⁶ = 1983790499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1983790573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330631758 + ... + 330631763.

It is an arithmetic number, because the mean of its divisors is an integer number (661263522).

Almost surely, 2^1983790563 is an apocalyptic number.

1983790563 is a deficient number, since it is larger than the sum of its proper divisors (661263525).

1983790563 is an equidigital number, since it uses as much as digits as its factorization.

1983790563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661263524.

The product of its (nonzero) digits is 1224720, while the sum is 51.

The square root of 1983790563 is about 44539.7638408647. The cubic root of 1983790563 is about 1256.5080442568.

The spelling of 1983790563 in words is "one billion, nine hundred eighty-three million, seven hundred ninety thousand, five hundred sixty-three".