1666343 has 12 divisors (see below), whose sum is σ = 2002752. Its totient is φ = 1380960.

The previous prime is 1666339. The next prime is 1666351. The reversal of 1666343 is 3436661.

It is not a de Polignac number, because 1666343 - 2² = 1666339 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 971 + ... + 2067.

It is an arithmetic number, because the mean of its divisors is an integer number (166896).

2^1666343 is an apocalyptic number.

1666343 is a deficient number, since it is larger than the sum of its proper divisors (336409).

1666343 is a wasteful number, since it uses less digits than its factorization.

1666343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142 (or 1135 counting only the distinct ones).

The product of its digits is 7776, while the sum is 29.

The square root of 1666343 is about 1290.8690870882. The cubic root of 1666343 is about 118.5554346675. Note that the first 3 decimals are identical.

The spelling of 1666343 in words is "one million, six hundred sixty-six thousand, three hundred forty-three".