6400043 has 8 divisors (see below), whose sum is σ = 7115136. Its totient is φ = 5716800.

The previous prime is 6400033. The next prime is 6400091. The reversal of 6400043 is 3400046.

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

It is a cyclic number.

It is not a de Polignac number, because 6400043 - 2¹² = 6395947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6399994 and 6400030.

It is not an unprimeable number, because it can be changed into a prime (6400013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7538 + ... + 8343.

It is an arithmetic number, because the mean of its divisors is an integer number (889392).

Almost surely, 2^6400043 is an apocalyptic number.

6400043 is a deficient number, since it is larger than the sum of its proper divisors (715093).

6400043 is a wasteful number, since it uses less digits than its factorization.

6400043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15925.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 6400043 is about 2529.8306267416. The cubic root of 6400043 is about 185.6639691526.

Adding to 6400043 its reverse (3400046), we get a palindrome (9800089).

The spelling of 6400043 in words is "six million, four hundred thousand, forty-three".