1660943 has 2 divisors, whose sum is σ = 1660944. Its totient is φ = 1660942.

The previous prime is 1660921. The next prime is 1660957. The reversal of 1660943 is 3490661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1660943 - 2¹⁰ = 1659919 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830471 + 830472.

It is an arithmetic number, because the mean of its divisors is an integer number (830472).

2^1660943 is an apocalyptic number.

1660943 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660943 is an equidigital number, since it uses as much as digits as its factorization.

1660943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 1660943 is about 1288.7757756879. The cubic root of 1660943 is about 118.4272313415.

The spelling of 1660943 in words is "one million, six hundred sixty thousand, nine hundred forty-three".