669743 has 4 divisors (see below), whose sum is σ = 679248. Its totient is φ = 660240.

The previous prime is 669733. The next prime is 669763. The reversal of 669743 is 347966.

669743 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 669743 - 2⁶ = 669679 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 (669733) 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, 4646 + ... + 4787.

It is an arithmetic number, because the mean of its divisors is an integer number (169812).

2⁶⁶⁹⁷⁴³ is an apocalyptic number.

669743 is a deficient number, since it is larger than the sum of its proper divisors (9505).

669743 is an equidigital number, since it uses as much as digits as its factorization.

669743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9504.

The product of its digits is 27216, while the sum is 35.

The square root of 669743 is about 818.3782743939. The cubic root of 669743 is about 87.4922115517.

The spelling of 669743 in words is "six hundred sixty-nine thousand, seven hundred forty-three".