1687696 has 20 divisors (see below), whose sum is σ = 3290092. Its totient is φ = 838656.

The previous prime is 1687669. The next prime is 1687729. The reversal of 1687696 is 6967861.

It can be written as a sum of positive squares in 2 ways, for example, as 160000 + 1527696 = 400^2 + 1236^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4840 + ... + 5176.

2^1687696 is an apocalyptic number.

1687696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1687696 is a deficient number, since it is larger than the sum of its proper divisors (1602396).

1687696 is a wasteful number, since it uses less digits than its factorization.

1687696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658 (or 652 counting only the distinct ones).

The product of its digits is 108864, while the sum is 43.

The square root of 1687696 is about 1299.1135439214. The cubic root of 1687696 is about 119.0596880615.

The spelling of 1687696 in words is "one million, six hundred eighty-seven thousand, six hundred ninety-six".