669479 has 2 divisors, whose sum is σ = 669480. Its totient is φ = 669478.

The previous prime is 669463. The next prime is 669481. The reversal of 669479 is 974966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669479 - 2⁴ = 669463 is a prime.

Together with 669481, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669419) 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 as a sum of consecutive naturals, namely, 334739 + 334740.

It is an arithmetic number, because the mean of its divisors is an integer number (334740).

2⁶⁶⁹⁴⁷⁹ is an apocalyptic number.

669479 is a deficient number, since it is larger than the sum of its proper divisors (1).

669479 is an equidigital number, since it uses as much as digits as its factorization.

669479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 41.

The square root of 669479 is about 818.2169638916. The cubic root of 669479 is about 87.4807141169.

The spelling of 669479 in words is "six hundred sixty-nine thousand, four hundred seventy-nine".