669983 has 4 divisors (see below), whose sum is σ = 685608. Its totient is φ = 654360.

The previous prime is 669971. The next prime is 669989. The reversal of 669983 is 389966.

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 669983 - 2¹⁰ = 668959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 669983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669989) 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 3 ways as a sum of consecutive naturals, for example, 7748 + ... + 7833.

It is an arithmetic number, because the mean of its divisors is an integer number (171402).

2⁶⁶⁹⁹⁸³ is an apocalyptic number.

669983 is a deficient number, since it is larger than the sum of its proper divisors (15625).

669983 is a wasteful number, since it uses less digits than its factorization.

669983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15624.

The product of its digits is 69984, while the sum is 41.

The square root of 669983 is about 818.5248927186. The cubic root of 669983 is about 87.5026611436.

The spelling of 669983 in words is "six hundred sixty-nine thousand, nine hundred eighty-three".