1983521 has 4 divisors (see below), whose sum is σ = 2017200. Its totient is φ = 1949844.

The previous prime is 1983503. The next prime is 1983523. The reversal of 1983521 is 1253891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1253891 = 23 ⋅54517.

It is a cyclic number.

It is not a de Polignac number, because 1983521 - 2¹⁴ = 1967137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1983523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16751 + ... + 16868.

It is an arithmetic number, because the mean of its divisors is an integer number (504300).

2^1983521 is an apocalyptic number.

It is an amenable number.

1983521 is a deficient number, since it is larger than the sum of its proper divisors (33679).

1983521 is an equidigital number, since it uses as much as digits as its factorization.

1983521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33678.

The product of its digits is 2160, while the sum is 29.

The square root of 1983521 is about 1408.3753050945. The cubic root of 1983521 is about 125.6451129072.

The spelling of 1983521 in words is "one million, nine hundred eighty-three thousand, five hundred twenty-one".