6420959 has 2 divisors, whose sum is σ = 6420960. Its totient is φ = 6420958.

The previous prime is 6420913. The next prime is 6420961. The reversal of 6420959 is 9590246.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6420959 is a prime.

Together with 6420961, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 6⁶ + 4¹⁰ + 2¹³ + 0 + 9⁶ + 5⁵ + 9⁷ .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6420989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210479 + 3210480.

It is an arithmetic number, because the mean of its divisors is an integer number (3210480).

Almost surely, 2^6420959 is an apocalyptic number.

6420959 is a deficient number, since it is larger than the sum of its proper divisors (1).

6420959 is an equidigital number, since it uses as much as digits as its factorization.

6420959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 6420959 is about 2533.9611283522. The cubic root of 6420959 is about 185.8660055477.

The spelling of 6420959 in words is "six million, four hundred twenty thousand, nine hundred fifty-nine".