6489999 has 6 divisors (see below), whose sum is σ = 9374456. Its totient is φ = 4326660.

The previous prime is 6489991. The next prime is 6490007. The reversal of 6489999 is 9999846.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6489991) and next prime (6490007).

It is not a de Polignac number, because 6489999 - 2³ = 6489991 is a prime.

It is a Duffinian number.

6489999 is a modest number, since divided by 9999 gives 648 as remainder.

6489999 is a lucky number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6489991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 360547 + ... + 360564.

Almost surely, 2^6489999 is an apocalyptic number.

6489999 is a deficient number, since it is larger than the sum of its proper divisors (2884457).

6489999 is a wasteful number, since it uses less digits than its factorization.

6489999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721117 (or 721114 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 54.

The square root of 6489999 is about 2547.5476443042. The cubic root of 6489999 is about 186.5297937245.

The spelling of 6489999 in words is "six million, four hundred eighty-nine thousand, nine hundred ninety-nine".