6440016 has 40 divisors (see below), whose sum is σ = 18150624. Its totient is φ = 1951360.

The previous prime is 6440011. The next prime is 6440029. The reversal of 6440016 is 6100446.

It is a junction number, because it is equal to n+sod(n) for n = 6439974 and 6440001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5571 + ... + 6626.

Almost surely, 2^6440016 is an apocalyptic number.

6440016 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

6440016 is an abundant number, since it is smaller than the sum of its proper divisors (11710608).

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

6440016 is a wasteful number, since it uses less digits than its factorization.

6440016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12219 (or 12213 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 6440016 is about 2537.7186605296. The cubic root of 6440016 is about 186.0497034472.

The spelling of 6440016 in words is "six million, four hundred forty thousand, sixteen".