669799 has 8 divisors (see below), whose sum is σ = 733040. Its totient is φ = 608256.

The previous prime is 669791. The next prime is 669839. The reversal of 669799 is 997966.

669799 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 cyclic number.

It is not a de Polignac number, because 669799 - 2³ = 669791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669791) 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, 487 + ... + 1255.

It is an arithmetic number, because the mean of its divisors is an integer number (91630).

2⁶⁶⁹⁷⁹⁹ is an apocalyptic number.

669799 is a deficient number, since it is larger than the sum of its proper divisors (63241).

669799 is a wasteful number, since it uses less digits than its factorization.

669799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849.

The product of its digits is 183708, while the sum is 46.

The square root of 669799 is about 818.4124876858. The cubic root of 669799 is about 87.4946500130.

The spelling of 669799 in words is "six hundred sixty-nine thousand, seven hundred ninety-nine".