669397 has 8 divisors (see below), whose sum is σ = 693056. Its totient is φ = 646272.

The previous prime is 669391. The next prime is 669401. The reversal of 669397 is 793966.

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 669397 - 2¹⁹ = 145109 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 (669391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6448 + ... + 6550.

It is an arithmetic number, because the mean of its divisors is an integer number (86632).

2⁶⁶⁹³⁹⁷ is an apocalyptic number.

669397 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

669397 is a deficient number, since it is larger than the sum of its proper divisors (23659).

669397 is a wasteful number, since it uses less digits than its factorization.

669397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267.

The product of its digits is 61236, while the sum is 40.

The square root of 669397 is about 818.1668533985. The cubic root of 669397 is about 87.4771423287.

The spelling of 669397 in words is "six hundred sixty-nine thousand, three hundred ninety-seven".