8421147 has 12 divisors (see below), whose sum is σ = 13901680. Its totient is φ = 4812048.

The previous prime is 8421143. The next prime is 8421167. The reversal of 8421147 is 7411248.

8421147 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8421147 - 2² = 8421143 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8421147.

It is not an unprimeable number, because it can be changed into a prime (8421143) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66772 + ... + 66897.

Almost surely, 2^8421147 is an apocalyptic number.

8421147 is a deficient number, since it is larger than the sum of its proper divisors (5480533).

8421147 is a wasteful number, since it uses less digits than its factorization.

8421147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133682 (or 133679 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 8421147 is about 2901.9212601309. The cubic root of 8421147 is about 203.4497136020.

The spelling of 8421147 in words is "eight million, four hundred twenty-one thousand, one hundred forty-seven".