669854 has 8 divisors (see below), whose sum is σ = 1028280. Its totient is φ = 327096.

The previous prime is 669853. The next prime is 669857. The reversal of 669854 is 458966.

669854 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669854.

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, 3809 + ... + 3980.

It is an arithmetic number, because the mean of its divisors is an integer number (128535).

669854 is a Friedman number, since it can be written as 86*(9+6^5+4), using all its digits and the basic arithmetic operations.

2⁶⁶⁹⁸⁵⁴ is an apocalyptic number.

669854 is a deficient number, since it is larger than the sum of its proper divisors (358426).

669854 is a wasteful number, since it uses less digits than its factorization.

669854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7834.

The product of its digits is 51840, while the sum is 38.

The square root of 669854 is about 818.4460886338. The cubic root of 669854 is about 87.4970447982.

The spelling of 669854 in words is "six hundred sixty-nine thousand, eight hundred fifty-four".