1681996 has 6 divisors (see below), whose sum is σ = 2943500. Its totient is φ = 840996.

The previous prime is 1681991. The next prime is 1682017. The reversal of 1681996 is 6991861.

It is a super-2 number, since 2×1681996² = 5658221088032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1681991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210246 + ... + 210253.

2^1681996 is an apocalyptic number.

It is an amenable number.

1681996 is a deficient number, since it is larger than the sum of its proper divisors (1261504).

1681996 is a wasteful number, since it uses less digits than its factorization.

1681996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420503 (or 420501 counting only the distinct ones).

The product of its digits is 23328, while the sum is 40.

The square root of 1681996 is about 1296.9178848331. The cubic root of 1681996 is about 118.9255000583.

The spelling of 1681996 in words is "one million, six hundred eighty-one thousand, nine hundred ninety-six".