669873 has 4 divisors (see below), whose sum is σ = 893168. Its totient is φ = 446580.

The previous prime is 669869. The next prime is 669887. The reversal of 669873 is 378966.

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 not a de Polignac number, because 669873 - 2² = 669869 is a prime.

It is a super-2 number, since 2×669873² = 897459672258, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669873.

It is not an unprimeable number, because it can be changed into a prime (669853) 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, 111643 + ... + 111648.

It is an arithmetic number, because the mean of its divisors is an integer number (223292).

2⁶⁶⁹⁸⁷³ is an apocalyptic number.

It is an amenable number.

669873 is a deficient number, since it is larger than the sum of its proper divisors (223295).

669873 is a wasteful number, since it uses less digits than its factorization.

669873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223294.

The product of its digits is 54432, while the sum is 39.

The square root of 669873 is about 818.4576959135. The cubic root of 669873 is about 87.4978720571.

The spelling of 669873 in words is "six hundred sixty-nine thousand, eight hundred seventy-three".