1681696 has 12 divisors (see below), whose sum is σ = 3310902. Its totient is φ = 840832.

The previous prime is 1681679. The next prime is 1681703. The reversal of 1681696 is 6961861.

It can be written as a sum of positive squares in only one way, i.e., 1073296 + 608400 = 1036^2 + 780^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26245 + ... + 26308.

2^1681696 is an apocalyptic number.

1681696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1681696 is a deficient number, since it is larger than the sum of its proper divisors (1629206).

1681696 is an equidigital number, since it uses as much as digits as its factorization.

1681696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52563 (or 52555 counting only the distinct ones).

The product of its digits is 15552, while the sum is 37.

The square root of 1681696 is about 1296.8022208494. The cubic root of 1681696 is about 118.9184291395.

The spelling of 1681696 in words is "one million, six hundred eighty-one thousand, six hundred ninety-six".