669993 has 4 divisors (see below), whose sum is σ = 893328. Its totient is φ = 446660.

The previous prime is 669989. The next prime is 670001. The reversal of 669993 is 399966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 669993 - 2² = 669989 is a prime.

It is a D-number.

669993 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (669913) 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, 111663 + ... + 111668.

It is an arithmetic number, because the mean of its divisors is an integer number (223332).

2⁶⁶⁹⁹⁹³ is an apocalyptic number.

It is an amenable number.

669993 is a deficient number, since it is larger than the sum of its proper divisors (223335).

669993 is a wasteful number, since it uses less digits than its factorization.

669993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223334.

The product of its digits is 78732, while the sum is 42.

The square root of 669993 is about 818.5310012455. The cubic root of 669993 is about 87.5030964891.

The spelling of 669993 in words is "six hundred sixty-nine thousand, nine hundred ninety-three".