1681443 has 12 divisors (see below), whose sum is σ = 2556840. Its totient is φ = 1061856.

The previous prime is 1681423. The next prime is 1681469. The reversal of 1681443 is 3441861.

It is not a de Polignac number, because 1681443 - 2⁵ = 1681411 is a prime.

It is a d-powerful number, because it can be written as 1 + 6⁸ + 8 + 1 + 4³ + 4⁵ + 3⁶ .

It is not an unprimeable number, because it can be changed into a prime (1681403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4746 + ... + 5087.

It is an arithmetic number, because the mean of its divisors is an integer number (213070).

2^1681443 is an apocalyptic number.

1681443 is a deficient number, since it is larger than the sum of its proper divisors (875397).

1681443 is a wasteful number, since it uses less digits than its factorization.

1681443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9858 (or 9855 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 1681443 is about 1296.7046695374. The cubic root of 1681443 is about 118.9124653443.

The spelling of 1681443 in words is "one million, six hundred eighty-one thousand, four hundred forty-three".