1983795787 has 4 divisors (see below), whose sum is σ = 2026004256. Its totient is φ = 1941587320.

The previous prime is 1983795767. The next prime is 1983795797. The reversal of 1983795787 is 7875973891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7875973891 = 49103 ⋅160397.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1983795787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1983795727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21104164 + ... + 21104257.

It is an arithmetic number, because the mean of its divisors is an integer number (506501064).

Almost surely, 2^1983795787 is an apocalyptic number.

1983795787 is a deficient number, since it is larger than the sum of its proper divisors (42208469).

1983795787 is an equidigital number, since it uses as much as digits as its factorization.

1983795787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42208468.

The product of its digits is 26671680, while the sum is 64.

The square root of 1983795787 is about 44539.8224850526. The cubic root of 1983795787 is about 1256.5091471946.

The spelling of 1983795787 in words is "one billion, nine hundred eighty-three million, seven hundred ninety-five thousand, seven hundred eighty-seven".