6403631838 has 8 divisors (see below), whose sum is σ = 12807263688. Its totient is φ = 2134543944.

The previous prime is 6403631833. The next prime is 6403631851. The reversal of 6403631838 is 8381363046.

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

6403631838 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 6403631838.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6403631833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533635981 + ... + 533635992.

It is an arithmetic number, because the mean of its divisors is an integer number (1600907961).

Almost surely, 2^6403631838 is an apocalyptic number.

6403631838 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6403631838 is a wasteful number, since it uses less digits than its factorization.

6403631838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067271978.

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 6403631838 is about 80022.6957681382. The cubic root of 6403631838 is about 1856.9866649238.

The spelling of 6403631838 in words is "six billion, four hundred three million, six hundred thirty-one thousand, eight hundred thirty-eight".