6459999 has 16 divisors (see below), whose sum is σ = 10601472. Its totient is φ = 3407328.

The previous prime is 6459991. The next prime is 6460031. The reversal of 6459999 is 9999546.

It is not a de Polignac number, because 6459999 - 2³ = 6459991 is a prime.

6459999 is a modest number, since divided by 9999 gives 645 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6459991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11559 + ... + 12104.

It is an arithmetic number, because the mean of its divisors is an integer number (662592).

Almost surely, 2^6459999 is an apocalyptic number.

6459999 is a deficient number, since it is larger than the sum of its proper divisors (4141473).

6459999 is a wasteful number, since it uses less digits than its factorization.

6459999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23686.

The product of its digits is 787320, while the sum is 51.

The square root of 6459999 is about 2541.6528087054. The cubic root of 6459999 is about 186.2419386028.

The spelling of 6459999 in words is "six million, four hundred fifty-nine thousand, nine hundred ninety-nine".