1681648 has 20 divisors (see below), whose sum is σ = 3313528. Its totient is φ = 826560.

The previous prime is 1681639. The next prime is 1681649. The reversal of 1681648 is 8461861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115 + ... + 1837.

2^1681648 is an apocalyptic number.

It is an amenable number.

1681648 is a deficient number, since it is larger than the sum of its proper divisors (1631880).

1681648 is a wasteful number, since it uses less digits than its factorization.

1681648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1792 (or 1786 counting only the distinct ones).

The product of its digits is 9216, while the sum is 34.

The square root of 1681648 is about 1296.7837136547. The cubic root of 1681648 is about 118.9172977145.

The spelling of 1681648 in words is "one million, six hundred eighty-one thousand, six hundred forty-eight".