6400047 has 8 divisors (see below), whose sum is σ = 8636544.
Its totient is φ = 4215128.
The previous prime is 6400033. The next prime is 6400091. The reversal of 6400047 is 7400046.
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 6400047 - 210 = 6399023 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 6399996 and 6400032.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (6408047) 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 7 ways as a sum of consecutive naturals, for example, 12603 + ... + 13100.
It is an arithmetic number, because the mean of its divisors is an integer number (1079568).
Almost surely, 26400047 is an apocalyptic number.
6400047 is a deficient number, since it is larger than the sum of its proper divisors (2236497).
6400047 is a wasteful number, since it uses less digits than its factorization.
6400047 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 25789.
The product of its (nonzero) digits is 672, while the sum is 21.
The square root of 6400047 is about 2529.8314173083.
The cubic root of 6400047 is about 185.6640078323.
Subtracting 6400047 from its reverse (7400046), we obtain a palindrome (999999).
The spelling of 6400047 in words is "six million, four hundred thousand, forty-seven".