8199947 has 4 divisors (see below), whose sum is σ = 9371376. Its totient is φ = 7028520.

The previous prime is 8199943. The next prime is 8199979. The reversal of 8199947 is 7499918.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7499918 = 2 ⋅3749959.

It is a cyclic number.

It is not a de Polignac number, because 8199947 - 2² = 8199943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8199941) 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, 585704 + ... + 585717.

It is an arithmetic number, because the mean of its divisors is an integer number (2342844).

Almost surely, 2^8199947 is an apocalyptic number.

8199947 is a deficient number, since it is larger than the sum of its proper divisors (1171429).

8199947 is a wasteful number, since it uses less digits than its factorization.

8199947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171428.

The product of its digits is 163296, while the sum is 47.

The square root of 8199947 is about 2863.5549584389. The cubic root of 8199947 is about 201.6525330653.

The spelling of 8199947 in words is "eight million, one hundred ninety-nine thousand, nine hundred forty-seven".