8021947 has 4 divisors (see below), whose sum is σ = 8030880. Its totient is φ = 8013016.

The previous prime is 8021941. The next prime is 8021969. The reversal of 8021947 is 7491208.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8021947 - 2³ = 8021939 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8021941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2947 + ... + 4972.

It is an arithmetic number, because the mean of its divisors is an integer number (2007720).

Almost surely, 2^8021947 is an apocalyptic number.

8021947 is a deficient number, since it is larger than the sum of its proper divisors (8933).

8021947 is a wasteful number, since it uses less digits than its factorization.

8021947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8932.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 8021947 is about 2832.3041856411. The cubic root of 8021947 is about 200.1827246743.

The spelling of 8021947 in words is "eight million, twenty-one thousand, nine hundred forty-seven".