6443431 has 4 divisors (see below), whose sum is σ = 6456600. Its totient is φ = 6430264.

The previous prime is 6443429. The next prime is 6443447. The reversal of 6443431 is 1343446.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6443431 - 2¹ = 6443429 is a prime.

It is a super-2 number, since 2×6443431² = 83035606103522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6443396 and 6443405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6443461) 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 3 ways as a sum of consecutive naturals, for example, 5821 + ... + 6838.

It is an arithmetic number, because the mean of its divisors is an integer number (1614150).

Almost surely, 2^6443431 is an apocalyptic number.

6443431 is a deficient number, since it is larger than the sum of its proper divisors (13169).

6443431 is a wasteful number, since it uses less digits than its factorization.

6443431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13168.

The product of its digits is 3456, while the sum is 25.

The square root of 6443431 is about 2538.3914197775. The cubic root of 6443431 is about 186.0825836690.

Adding to 6443431 its reverse (1343446), we get a palindrome (7786877).

The spelling of 6443431 in words is "six million, four hundred forty-three thousand, four hundred thirty-one".