669493 has 8 divisors (see below), whose sum is σ = 737856. Its totient is φ = 607420.

The previous prime is 669481. The next prime is 669527. The reversal of 669493 is 394966.

It is a de Polignac number, because none of the positive numbers 2^k-669493 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 (669413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1080 + ... + 1582.

It is an arithmetic number, because the mean of its divisors is an integer number (92232).

2⁶⁶⁹⁴⁹³ is an apocalyptic number.

It is an amenable number.

669493 is a deficient number, since it is larger than the sum of its proper divisors (68363).

669493 is an equidigital number, since it uses as much as digits as its factorization.

669493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536 (or 514 counting only the distinct ones).

The product of its digits is 34992, while the sum is 37.

The square root of 669493 is about 818.2255190349. The cubic root of 669493 is about 87.4813239052.

Subtracting from 669493 its product of digits (34992), we obtain a triangular number (634501 = T₁₁₂₆).

It can be divided in two parts, 66 and 9493, that added together give a palindrome (9559).

The spelling of 669493 in words is "six hundred sixty-nine thousand, four hundred ninety-three".