1681844 has 12 divisors (see below), whose sum is σ = 3116484. Its totient is φ = 791424.

The previous prime is 1681837. The next prime is 1681853. The reversal of 1681844 is 4481861.

It can be written as a sum of positive squares in 2 ways, for example, as 620944 + 1060900 = 788^2 + 1030^2 .

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 1681844.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12299 + ... + 12434.

It is an arithmetic number, because the mean of its divisors is an integer number (259707).

2^1681844 is an apocalyptic number.

It is an amenable number.

1681844 is a deficient number, since it is larger than the sum of its proper divisors (1434640).

1681844 is a wasteful number, since it uses less digits than its factorization.

1681844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24754 (or 24752 counting only the distinct ones).

The product of its digits is 6144, while the sum is 32.

The square root of 1681844 is about 1296.8592830373. The cubic root of 1681844 is about 118.9219175645.

The spelling of 1681844 in words is "one million, six hundred eighty-one thousand, eight hundred forty-four".