8129947 has 12 divisors (see below), whose sum is σ = 9629776. Its totient is φ = 6723360.

The previous prime is 8129939. The next prime is 8129963. The reversal of 8129947 is 7499218.

It is not a de Polignac number, because 8129947 - 2³ = 8129939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8129917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5197 + ... + 6577.

Almost surely, 2^8129947 is an apocalyptic number.

8129947 is a deficient number, since it is larger than the sum of its proper divisors (1499829).

8129947 is a wasteful number, since it uses less digits than its factorization.

8129947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446 (or 1417 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 8129947 is about 2851.3061919057. The cubic root of 8129947 is about 201.0770807394.

It can be divided in two parts, 812 and 9947, that multiplied together give a square (8076964 = 2842²).

The spelling of 8129947 in words is "eight million, one hundred twenty-nine thousand, nine hundred forty-seven".