6443964 has 36 divisors (see below), whose sum is σ = 17148040. Its totient is φ = 2034720.

The previous prime is 6443963. The next prime is 6443977. The reversal of 6443964 is 4693446.

6443964 is a `hidden beast` number, since 644 + 3 + 9 + 6 + 4 = 666.

6443964 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6443963) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4027 + ... + 5394.

Almost surely, 2^6443964 is an apocalyptic number.

It is an amenable number.

6443964 is an abundant number, since it is smaller than the sum of its proper divisors (10704076).

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

6443964 is a wasteful number, since it uses less digits than its factorization.

6443964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9450 (or 9445 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 6443964 is about 2538.4964053549. The cubic root of 6443964 is about 186.0877144388.

The spelling of 6443964 in words is "six million, four hundred forty-three thousand, nine hundred sixty-four".