1683421 has 4 divisors (see below), whose sum is σ = 1741500. Its totient is φ = 1625344.

The previous prime is 1683403. The next prime is 1683433. The reversal of 1683421 is 1243861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1243861 = 43 ⋅28927.

It can be written as a sum of positive squares in 2 ways, for example, as 1060900 + 622521 = 1030^2 + 789^2 .

It is a cyclic number.

It is not a de Polignac number, because 1683421 - 2⁷ = 1683293 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 (1683491) 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, 28996 + ... + 29053.

It is an arithmetic number, because the mean of its divisors is an integer number (435375).

2^1683421 is an apocalyptic number.

It is an amenable number.

1683421 is a deficient number, since it is larger than the sum of its proper divisors (58079).

1683421 is an equidigital number, since it uses as much as digits as its factorization.

1683421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58078.

The product of its digits is 1152, while the sum is 25.

The square root of 1683421 is about 1297.4671479463. The cubic root of 1683421 is about 118.9590754457.

The spelling of 1683421 in words is "one million, six hundred eighty-three thousand, four hundred twenty-one".