669985 has 8 divisors (see below), whose sum is σ = 821376. Its totient is φ = 524400.
The previous prime is 669971. The next prime is 669989. The reversal of 669985 is 589966.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 669985 - 27 = 669857 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (669989) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1191 + ... + 1660.
It is an arithmetic number, because the mean of its divisors is an integer number (102672).
2669985 is an apocalyptic number.
It is an amenable number.
669985 is a deficient number, since it is larger than the sum of its proper divisors (151391).
669985 is a wasteful number, since it uses less digits than its factorization.
669985 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2903.
The product of its digits is 116640, while the sum is 43.
The square root of 669985 is about 818.5261144276. The cubic root of 669985 is about 87.5027482130.
The spelling of 669985 in words is "six hundred sixty-nine thousand, nine hundred eighty-five".
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