6403855 has 8 divisors (see below), whose sum is σ = 8089200. Its totient is φ = 4853376.

The previous prime is 6403853. The next prime is 6403877. The reversal of 6403855 is 5583046.

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

It is a cyclic number.

It is not a de Polignac number, because 6403855 - 2¹ = 6403853 is a prime.

It is a super-2 number, since 2×6403855² = 82018717722050, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6403853) 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, 33610 + ... + 33799.

It is an arithmetic number, because the mean of its divisors is an integer number (1011150).

Almost surely, 2^6403855 is an apocalyptic number.

6403855 is a deficient number, since it is larger than the sum of its proper divisors (1685345).

6403855 is a wasteful number, since it uses less digits than its factorization.

6403855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67433.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 6403855 is about 2530.5839247099. The cubic root of 6403855 is about 185.7008236227.

The spelling of 6403855 in words is "six million, four hundred three thousand, eight hundred fifty-five".