6443938 has 8 divisors (see below), whose sum is σ = 9751788. Its totient is φ = 3193344.

The previous prime is 6443917. The next prime is 6443947. The reversal of 6443938 is 8393446.

It can be written as a sum of positive squares in 2 ways, for example, as 6436369 + 7569 = 2537^2 + 87^2 .

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

It is a super-5 number, since 5×6443938⁵ (a number of 35 digits) contains 55555 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6443897 and 6443906.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14031 + ... + 14482.

Almost surely, 2^6443938 is an apocalyptic number.

6443938 is a deficient number, since it is larger than the sum of its proper divisors (3307850).

6443938 is a wasteful number, since it uses less digits than its factorization.

6443938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28628.

The product of its digits is 62208, while the sum is 37.

The square root of 6443938 is about 2538.4912842080. The cubic root of 6443938 is about 186.0874641639.

It can be divided in two parts, 6443 and 938, that added together give a triangular number (7381 = T₁₂₁).

The spelling of 6443938 in words is "six million, four hundred forty-three thousand, nine hundred thirty-eight".