1689238 has 4 divisors (see below), whose sum is σ = 2533860. Its totient is φ = 844618.

The previous prime is 1689217. The next prime is 1689253. The reversal of 1689238 is 8329861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8329861 = 607 ⋅13723.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 1689197 and 1689206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422308 + ... + 422311.

It is an arithmetic number, because the mean of its divisors is an integer number (633465).

2^1689238 is an apocalyptic number.

1689238 is a deficient number, since it is larger than the sum of its proper divisors (844622).

1689238 is an equidigital number, since it uses as much as digits as its factorization.

1689238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844621.

The product of its digits is 20736, while the sum is 37.

The square root of 1689238 is about 1299.7068900333. The cubic root of 1689238 is about 119.0959375112.

The spelling of 1689238 in words is "one million, six hundred eighty-nine thousand, two hundred thirty-eight".