6443947 has 2 divisors, whose sum is σ = 6443948. Its totient is φ = 6443946.

The previous prime is 6443917. The next prime is 6443953. The reversal of 6443947 is 7493446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6443947 - 2¹¹ = 6441899 is a prime.

It is a super-5 number, since 5×6443947⁵ (a number of 35 digits) contains 55555 as substring.

It is a d-powerful number, because it can be written as 6 + 4⁷ + 4⁸ + 3⁵ + 9⁶ + 4⁸ + 7⁸ .

It is not a weakly prime, because it can be changed into another prime (6443917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3221973 + 3221974.

It is an arithmetic number, because the mean of its divisors is an integer number (3221974).

Almost surely, 2^6443947 is an apocalyptic number.

6443947 is a deficient number, since it is larger than the sum of its proper divisors (1).

6443947 is an equidigital number, since it uses as much as digits as its factorization.

6443947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 37.

The square root of 6443947 is about 2538.4930569139. The cubic root of 6443947 is about 186.0875507976.

The spelling of 6443947 in words is "six million, four hundred forty-three thousand, nine hundred forty-seven".