6386445040 has 20 divisors (see below), whose sum is σ = 14848484904. Its totient is φ = 2554577984.

The previous prime is 6386444971. The next prime is 6386445049. The reversal of 6386445040 is 405446836.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 6386444984 and 6386445002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6386445049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39915202 + ... + 39915361.

Almost surely, 2^6386445040 is an apocalyptic number.

It is an amenable number.

6386445040 is an abundant number, since it is smaller than the sum of its proper divisors (8462039864).

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

6386445040 is a wasteful number, since it uses less digits than its factorization.

6386445040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79830576 (or 79830570 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 40.

The square root of 6386445040 is about 79915.2365947821. The cubic root of 6386445040 is about 1855.3238454948.

The spelling of 6386445040 in words is "six billion, three hundred eighty-six million, four hundred forty-five thousand, forty".