6439863 has 8 divisors (see below), whose sum is σ = 8600688. Its totient is φ = 4286144.

The previous prime is 6439837. The next prime is 6439903. The reversal of 6439863 is 3689346.

6439863 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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 6439863 - 2⁸ = 6439607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6439063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 931 + ... + 3707.

It is an arithmetic number, because the mean of its divisors is an integer number (1075086).

Almost surely, 2^6439863 is an apocalyptic number.

6439863 is a deficient number, since it is larger than the sum of its proper divisors (2160825).

6439863 is a wasteful number, since it uses less digits than its factorization.

6439863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3553.

The product of its digits is 93312, while the sum is 39.

The square root of 6439863 is about 2537.6885151649. The cubic root of 6439863 is about 186.0482300642.

The spelling of 6439863 in words is "six million, four hundred thirty-nine thousand, eight hundred sixty-three".