8142947 has 4 divisors (see below), whose sum is σ = 8150856. Its totient is φ = 8135040.

The previous prime is 8142929. The next prime is 8142971. The reversal of 8142947 is 7492418.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7492418 = 2 ⋅3746209.

It is a cyclic number.

It is not a de Polignac number, because 8142947 - 2²⁰ = 7094371 is a prime.

It is a d-powerful number, because it can be written as 8⁷ + 1 + 4⁶ + 2¹³ + 9⁴ + 4⁹ + 7⁸ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8142907) 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, 2129 + ... + 4562.

It is an arithmetic number, because the mean of its divisors is an integer number (2037714).

Almost surely, 2^8142947 is an apocalyptic number.

8142947 is a deficient number, since it is larger than the sum of its proper divisors (7909).

8142947 is a wasteful number, since it uses less digits than its factorization.

8142947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7908.

The product of its digits is 16128, while the sum is 35.

The square root of 8142947 is about 2853.5849382838. The cubic root of 8142947 is about 201.1841995189.

The spelling of 8142947 in words is "eight million, one hundred forty-two thousand, nine hundred forty-seven".