6403885 has 8 divisors (see below), whose sum is σ = 7708896. Its totient is φ = 5106960.

The previous prime is 6403877. The next prime is 6403889. The reversal of 6403885 is 5883046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6403885 - 2³ = 6403877 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6403885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6403889) 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 in 7 ways as a sum of consecutive naturals, for example, 111 + ... + 3580.

It is an arithmetic number, because the mean of its divisors is an integer number (963612).

Almost surely, 2^6403885 is an apocalyptic number.

It is an amenable number.

6403885 is a deficient number, since it is larger than the sum of its proper divisors (1305011).

6403885 is a wasteful number, since it uses less digits than its factorization.

6403885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4043.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 6403885 is about 2530.5898521886. The cubic root of 6403885 is about 185.7011136051.

The spelling of 6403885 in words is "six million, four hundred three thousand, eight hundred eighty-five".