669143 has 4 divisors (see below), whose sum is σ = 671160. Its totient is φ = 667128.

The previous prime is 669133. The next prime is 669167. The reversal of 669143 is 341966.

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

It is a cyclic number.

It is not a de Polignac number, because 669143 - 2⁴ = 669127 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669113) 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, 380 + ... + 1217.

It is an arithmetic number, because the mean of its divisors is an integer number (167790).

2⁶⁶⁹¹⁴³ is an apocalyptic number.

669143 is a deficient number, since it is larger than the sum of its proper divisors (2017).

669143 is a wasteful number, since it uses less digits than its factorization.

669143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2016.

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

The square root of 669143 is about 818.0116136095. The cubic root of 669143 is about 87.4660766457.

The spelling of 669143 in words is "six hundred sixty-nine thousand, one hundred forty-three".