6459993 has 20 divisors (see below), whose sum is σ = 9726948. Its totient is φ = 4272480.

The previous prime is 6459991. The next prime is 6460031. The reversal of 6459993 is 3999546.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4173849 + 2286144 = 2043^2 + 1512^2 .

It is not a de Polignac number, because 6459993 - 2¹ = 6459991 is a prime.

It is a Curzon number.

6459993 is a lucky 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 19 ways as a sum of consecutive naturals, for example, 13783 + ... + 14243.

Almost surely, 2^6459993 is an apocalyptic number.

It is an amenable number.

6459993 is a deficient number, since it is larger than the sum of its proper divisors (3266955).

6459993 is a wasteful number, since it uses less digits than its factorization.

6459993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646 (or 637 counting only the distinct ones).

The product of its digits is 262440, while the sum is 45.

The square root of 6459993 is about 2541.6516283708. The cubic root of 6459993 is about 186.2418809427.

The spelling of 6459993 in words is "six million, four hundred fifty-nine thousand, nine hundred ninety-three".