1983945 has 8 divisors (see below), whose sum is σ = 3174336. Its totient is φ = 1058096.

The previous prime is 1983931. The next prime is 1983967. The reversal of 1983945 is 5493891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1983945 - 2⁴ = 1983929 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 66117 + ... + 66146.

It is an arithmetic number, because the mean of its divisors is an integer number (396792).

2^1983945 is an apocalyptic number.

1983945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1983945 is a deficient number, since it is larger than the sum of its proper divisors (1190391).

1983945 is a wasteful number, since it uses less digits than its factorization.

1983945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132271.

The product of its digits is 38880, while the sum is 39.

The square root of 1983945 is about 1408.5258251094. The cubic root of 1983945 is about 125.6540649563.

The spelling of 1983945 in words is "one million, nine hundred eighty-three thousand, nine hundred forty-five".