6403863 has 4 divisors (see below), whose sum is σ = 8538488. Its totient is φ = 4269240.

The previous prime is 6403853. The next prime is 6403877. The reversal of 6403863 is 3683046.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6403863 - 2⁴ = 6403847 is a prime.

It is a super-2 number, since 2×6403863² = 82018922645538, which contains 22 as substring.

It is a D-number.

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 6403863.

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 3 ways as a sum of consecutive naturals, for example, 1067308 + ... + 1067313.

It is an arithmetic number, because the mean of its divisors is an integer number (2134622).

Almost surely, 2^6403863 is an apocalyptic number.

6403863 is a deficient number, since it is larger than the sum of its proper divisors (2134625).

6403863 is a wasteful number, since it uses less digits than its factorization.

6403863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2134624.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 6403863 is about 2530.5855053722. The cubic root of 6403863 is about 185.7009009514.

The spelling of 6403863 in words is "six million, four hundred three thousand, eight hundred sixty-three".