1668143 has 4 divisors (see below), whose sum is σ = 1755960. Its totient is φ = 1580328.

The previous prime is 1668137. The next prime is 1668197. The reversal of 1668143 is 3418661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1668143 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 (1668113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43880 + ... + 43917.

It is an arithmetic number, because the mean of its divisors is an integer number (438990).

2^1668143 is an apocalyptic number.

1668143 is a deficient number, since it is larger than the sum of its proper divisors (87817).

1668143 is an equidigital number, since it uses as much as digits as its factorization.

1668143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87816.

The product of its digits is 3456, while the sum is 29.

The square root of 1668143 is about 1291.5661036122. The cubic root of 1668143 is about 118.5981075525.

The spelling of 1668143 in words is "one million, six hundred sixty-eight thousand, one hundred forty-three".