646379 has 2 divisors, whose sum is σ = 646380. Its totient is φ = 646378.

The previous prime is 646339. The next prime is 646397. The reversal of 646379 is 973646.

Together with next prime (646397) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646379 - 2¹⁶ = 580843 is a prime.

It is a d-powerful number, because it can be written as 6³ + 4⁸ + 3⁷ + 6⁶ + 7³ + 9⁶ .

It is not a weakly prime, because it can be changed into another prime (646309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323189 + 323190.

It is an arithmetic number, because the mean of its divisors is an integer number (323190).

2⁶⁴⁶³⁷⁹ is an apocalyptic number.

646379 is a deficient number, since it is larger than the sum of its proper divisors (1).

646379 is an equidigital number, since it uses as much as digits as its factorization.

646379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 35.

The square root of 646379 is about 803.9769897205. The cubic root of 646379 is about 86.4627569744.

It can be divided in two parts, 64637 and 9, that added together give a palindrome (64646).

The spelling of 646379 in words is "six hundred forty-six thousand, three hundred seventy-nine".