6421947 has 16 divisors (see below), whose sum is σ = 9884160. Its totient is φ = 3632832.

The previous prime is 6421931. The next prime is 6421967. The reversal of 6421947 is 7491246.

It is a happy number.

It is not a de Polignac number, because 6421947 - 2⁴ = 6421931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6421907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 679 + ... + 3647.

It is an arithmetic number, because the mean of its divisors is an integer number (617760).

Almost surely, 2^6421947 is an apocalyptic number.

6421947 is a deficient number, since it is larger than the sum of its proper divisors (3462213).

6421947 is a wasteful number, since it uses less digits than its factorization.

6421947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3082.

The product of its digits is 12096, while the sum is 33.

The square root of 6421947 is about 2534.1560725417. The cubic root of 6421947 is about 185.8755381942.

The spelling of 6421947 in words is "six million, four hundred twenty-one thousand, nine hundred forty-seven".