1662943 has 2 divisors, whose sum is σ = 1662944. Its totient is φ = 1662942.

The previous prime is 1662929. The next prime is 1662953. The reversal of 1662943 is 3492661.

It is a strong prime.

It is an emirp because it is prime and its reverse (3492661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1662943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1662953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831471 + 831472.

It is an arithmetic number, because the mean of its divisors is an integer number (831472).

2^1662943 is an apocalyptic number.

1662943 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662943 is an equidigital number, since it uses as much as digits as its factorization.

1662943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 31.

The square root of 1662943 is about 1289.5514724120. The cubic root of 1662943 is about 118.4747464093.

The spelling of 1662943 in words is "one million, six hundred sixty-two thousand, nine hundred forty-three".