1688474 has 16 divisors (see below), whose sum is σ = 2735208. Its totient is φ = 778752.

The previous prime is 1688471. The next prime is 1688497. The reversal of 1688474 is 4748861.

It can be written as a sum of positive squares in 4 ways, for example, as 1423249 + 265225 = 1193^2 + 515^2 .

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1688471) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 1334 + ... + 2270.

2^1688474 is an apocalyptic number.

1688474 is a deficient number, since it is larger than the sum of its proper divisors (1046734).

1688474 is a wasteful number, since it uses less digits than its factorization.

1688474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009.

The product of its digits is 43008, while the sum is 38.

The square root of 1688474 is about 1299.4129443714. The cubic root of 1688474 is about 119.0779801014.

The spelling of 1688474 in words is "one million, six hundred eighty-eight thousand, four hundred seventy-four".