1689704 has 8 divisors (see below), whose sum is σ = 3168210. Its totient is φ = 844848.

The previous prime is 1689703. The next prime is 1689707. The reversal of 1689704 is 4079861.

It can be written as a sum of positive squares in only one way, i.e., 1684804 + 4900 = 1298^2 + 70^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1689703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105599 + ... + 105614.

2^1689704 is an apocalyptic number.

It is an amenable number.

1689704 is a deficient number, since it is larger than the sum of its proper divisors (1478506).

1689704 is a wasteful number, since it uses less digits than its factorization.

1689704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211219 (or 211215 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1689704 is about 1299.8861488607. The cubic root of 1689704 is about 119.1068879327.

The spelling of 1689704 in words is "one million, six hundred eighty-nine thousand, seven hundred four".