6443980 has 48 divisors (see below), whose sum is σ = 14192640. Its totient is φ = 2455488.

The previous prime is 6443977. The next prime is 6443981. The reversal of 6443980 is 893446.

It is not an unprimeable number, because it can be changed into a prime (6443981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50677 + ... + 50803.

It is an arithmetic number, because the mean of its divisors is an integer number (295680).

Almost surely, 2^6443980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6443980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7096320).

6443980 is an abundant number, since it is smaller than the sum of its proper divisors (7748660).

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

6443980 is a wasteful number, since it uses less digits than its factorization.

6443980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238 (or 236 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 6443980 is about 2538.4995568249. The cubic root of 6443980 is about 186.0878684538.

It can be divided in two parts, 644 and 3980, that added together give a square (4624 = 68²).

The spelling of 6443980 in words is "six million, four hundred forty-three thousand, nine hundred eighty".