6478999 has 2 divisors, whose sum is σ = 6479000. Its totient is φ = 6478998.

The previous prime is 6478991. The next prime is 6479003. The reversal of 6478999 is 9998746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6478999 - 2³ = 6478991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6478991) 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, 3239499 + 3239500.

It is an arithmetic number, because the mean of its divisors is an integer number (3239500).

Almost surely, 2^6478999 is an apocalyptic number.

6478999 is a deficient number, since it is larger than the sum of its proper divisors (1).

6478999 is an equidigital number, since it uses as much as digits as its factorization.

6478999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 52.

The square root of 6478999 is about 2545.3877897091. The cubic root of 6478999 is about 186.4243500489.

The spelling of 6478999 in words is "six million, four hundred seventy-eight thousand, nine hundred ninety-nine".