6403545 has 36 divisors (see below), whose sum is σ = 11646180. Its totient is φ = 3254592.

The previous prime is 6403511. The next prime is 6403571. The reversal of 6403545 is 5453046.

It can be written as a sum of positive squares in 2 ways, for example, as 1218816 + 5184729 = 1104^2 + 2277^2 .

It is not a de Polignac number, because 6403545 - 2⁷ = 6403417 is a prime.

It is an unprimeable number.

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 in 35 ways as a sum of consecutive naturals, for example, 23671 + ... + 23939.

It is an arithmetic number, because the mean of its divisors is an integer number (323505).

Almost surely, 2^6403545 is an apocalyptic number.

It is an amenable number.

6403545 is a deficient number, since it is larger than the sum of its proper divisors (5242635).

6403545 is a wasteful number, since it uses less digits than its factorization.

6403545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326 (or 300 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 6403545 is about 2530.5226732831. The cubic root of 6403545 is about 185.6978270847.

The spelling of 6403545 in words is "six million, four hundred three thousand, five hundred forty-five".