1659843 has 12 divisors (see below), whose sum is σ = 2453880. Its totient is φ = 1080576.

The previous prime is 1659817. The next prime is 1659851. The reversal of 1659843 is 3489561.

It is not a de Polignac number, because 1659843 - 2⁵ = 1659811 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1659798 and 1659807.

It is not an unprimeable number, because it can be changed into a prime (1659883) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1758 + ... + 2531.

It is an arithmetic number, because the mean of its divisors is an integer number (204490).

2^1659843 is an apocalyptic number.

1659843 is a deficient number, since it is larger than the sum of its proper divisors (794037).

1659843 is a wasteful number, since it uses less digits than its factorization.

1659843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4338 (or 4335 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 1659843 is about 1288.3489434156. The cubic root of 1659843 is about 118.4010817940.

It can be divided in two parts, 16598 and 43, that added together give a square (16641 = 129²).

The spelling of 1659843 in words is "one million, six hundred fifty-nine thousand, eight hundred forty-three".