669379 has 2 divisors, whose sum is σ = 669380. Its totient is φ = 669378.

The previous prime is 669377. The next prime is 669391. The reversal of 669379 is 973966.

669379 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 669379 - 2¹ = 669377 is a prime.

Together with 669377, it forms a pair of twin primes.

669379 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (669371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334689 + 334690.

It is an arithmetic number, because the mean of its divisors is an integer number (334690).

2⁶⁶⁹³⁷⁹ is an apocalyptic number.

669379 is a deficient number, since it is larger than the sum of its proper divisors (1).

669379 is an equidigital number, since it uses as much as digits as its factorization.

669379 is an evil number, because the sum of its binary digits is even.

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

The square root of 669379 is about 818.1558531234. The cubic root of 669379 is about 87.4763582386.

The spelling of 669379 in words is "six hundred sixty-nine thousand, three hundred seventy-nine".