1983421 has 4 divisors (see below), whose sum is σ = 2163744. Its totient is φ = 1803100.

The previous prime is 1983413. The next prime is 1983427. The reversal of 1983421 is 1243891.

It is a happy number.

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: 1243891 = 11 ⋅113081.

It is a cyclic number.

It is not a de Polignac number, because 1983421 - 2³ = 1983413 is a prime.

1983421 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1983421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1983427) 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, 90145 + ... + 90166.

It is an arithmetic number, because the mean of its divisors is an integer number (540936).

2^1983421 is an apocalyptic number.

1983421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1983421 is a deficient number, since it is larger than the sum of its proper divisors (180323).

1983421 is a wasteful number, since it uses less digits than its factorization.

1983421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180322.

The product of its digits is 1728, while the sum is 28.

The square root of 1983421 is about 1408.3398027465. The cubic root of 1983421 is about 125.6430013889.

The spelling of 1983421 in words is "one million, nine hundred eighty-three thousand, four hundred twenty-one".