1682221 has 4 divisors (see below), whose sum is σ = 1688572. Its totient is φ = 1675872.

The previous prime is 1682207. The next prime is 1682237. The reversal of 1682221 is 1222861.

It is the 530-th star number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1222861 = 17 ⋅71933.

It can be written as a sum of positive squares in 2 ways, for example, as 940900 + 741321 = 970^2 + 861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1682221 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1682192 and 1682201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1682251) 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, 2760 + ... + 3313.

It is an arithmetic number, because the mean of its divisors is an integer number (422143).

2^1682221 is an apocalyptic number.

It is an amenable number.

1682221 is a deficient number, since it is larger than the sum of its proper divisors (6351).

1682221 is an equidigital number, since it uses as much as digits as its factorization.

1682221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6350.

The product of its digits is 384, while the sum is 22.

The square root of 1682221 is about 1297.0046260519. The cubic root of 1682221 is about 118.9308026957.

The spelling of 1682221 in words is "one million, six hundred eighty-two thousand, two hundred twenty-one".