1983603 has 4 divisors (see below), whose sum is σ = 2644808. Its totient is φ = 1322400.

The previous prime is 1983601. The next prime is 1983643. The reversal of 1983603 is 3063891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3063891 = 3 ⋅1021297.

It is not a de Polignac number, because 1983603 - 2¹ = 1983601 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1983601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330598 + ... + 330603.

It is an arithmetic number, because the mean of its divisors is an integer number (661202).

2^1983603 is an apocalyptic number.

1983603 is a deficient number, since it is larger than the sum of its proper divisors (661205).

1983603 is an equidigital number, since it uses as much as digits as its factorization.

1983603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661204.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 1983603 is about 1408.4044163521. The cubic root of 1983603 is about 125.6468442992.

The spelling of 1983603 in words is "one million, nine hundred eighty-three thousand, six hundred three".