6400747 has 4 divisors (see below), whose sum is σ = 6412680. Its totient is φ = 6388816.

The previous prime is 6400717. The next prime is 6400753. The reversal of 6400747 is 7470046.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6400747 is a prime.

It is a Duffinian number.

6400747 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6400717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5122 + ... + 6247.

It is an arithmetic number, because the mean of its divisors is an integer number (1603170).

Almost surely, 2^6400747 is an apocalyptic number.

6400747 is a deficient number, since it is larger than the sum of its proper divisors (11933).

6400747 is a wasteful number, since it uses less digits than its factorization.

6400747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11932.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 6400747 is about 2529.9697626652. The cubic root of 6400747 is about 185.6707765361.

The spelling of 6400747 in words is "six million, four hundred thousand, seven hundred forty-seven".