1983921 has 8 divisors (see below), whose sum is σ = 2681760. Its totient is φ = 1304352.

The previous prime is 1983913. The next prime is 1983929. The reversal of 1983921 is 1293891.

It is an interprime number because it is at equal distance from previous prime (1983913) and next prime (1983929).

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

It is not a de Polignac number, because 1983921 - 2³ = 1983913 is a prime.

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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4311 + ... + 4748.

It is an arithmetic number, because the mean of its divisors is an integer number (335220).

2^1983921 is an apocalyptic number.

It is an amenable number.

1983921 is a deficient number, since it is larger than the sum of its proper divisors (697839).

1983921 is an equidigital number, since it uses as much as digits as its factorization.

1983921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9135.

The product of its digits is 3888, while the sum is 33.

The square root of 1983921 is about 1408.5173055380. The cubic root of 1983921 is about 125.6535582706.

The spelling of 1983921 in words is "one million, nine hundred eighty-three thousand, nine hundred twenty-one".