1660843 has 2 divisors, whose sum is σ = 1660844. Its totient is φ = 1660842.

The previous prime is 1660837. The next prime is 1660871. The reversal of 1660843 is 3480661.

It is an a-pointer prime, because the next prime (1660871) can be obtained adding 1660843 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1660843 is a prime.

It is not a weakly prime, because it can be changed into another prime (1660873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830421 + 830422.

It is an arithmetic number, because the mean of its divisors is an integer number (830422).

2^1660843 is an apocalyptic number.

1660843 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660843 is an equidigital number, since it uses as much as digits as its factorization.

1660843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1660843 is about 1288.7369785957. The cubic root of 1660843 is about 118.4248545871.

The spelling of 1660843 in words is "one million, six hundred sixty thousand, eight hundred forty-three".