1983959 has 4 divisors (see below), whose sum is σ = 1986816. Its totient is φ = 1981104.

The previous prime is 1983931. The next prime is 1983967. The reversal of 1983959 is 9593891.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9593891 = 479 ⋅20029.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1983959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1983929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362 + ... + 2024.

It is an arithmetic number, because the mean of its divisors is an integer number (496704).

2^1983959 is an apocalyptic number.

1983959 is a deficient number, since it is larger than the sum of its proper divisors (2857).

1983959 is a wasteful number, since it uses less digits than its factorization.

1983959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2856.

The product of its digits is 87480, while the sum is 44.

The square root of 1983959 is about 1408.5307948355. The cubic root of 1983959 is about 125.6543605211.

The spelling of 1983959 in words is "one million, nine hundred eighty-three thousand, nine hundred fifty-nine".