1682209 has 3 divisors (see below), whose sum is σ = 1683507. Its totient is φ = 1680912.

The previous prime is 1682207. The next prime is 1682237. The reversal of 1682209 is 9022861.

It is a happy number.

The square root of 1682209 is 1297.

It is a perfect power (a square), and thus also a powerful number.

1682209 is nontrivially palindromic in base 6.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1677025 + 5184 = 1295^2 + 72^2 .

It is not a de Polignac number, because 1682209 - 2¹ = 1682207 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1682207) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 649 + ... + 1945.

It is an arithmetic number, because the mean of its divisors is an integer number (561169).

2^1682209 is an apocalyptic number.

1682209 is the 1297-th square number.

1682209 is the 649-th centered octagonal number.

It is an amenable number.

1682209 is a deficient number, since it is larger than the sum of its proper divisors (1298).

1682209 is an frugal number, since it uses more digits than its factorization.

1682209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594 (or 1297 counting only the distinct ones).

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

The cubic root of 1682209 is about 118.9305199003.

It can be divided in two parts, 1682 and 209, that added together give a triangular number (1891 = T₆₁).

The spelling of 1682209 in words is "one million, six hundred eighty-two thousand, two hundred nine".