8391946 has 4 divisors (see below), whose sum is σ = 12587922. Its totient is φ = 4195972.

The previous prime is 8391937. The next prime is 8391947. The reversal of 8391946 is 6491938.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7080921 + 1311025 = 2661^2 + 1145^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 8391899 and 8391908.

It is not an unprimeable number, because it can be changed into a prime (8391947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2097985 + ... + 2097988.

Almost surely, 2^8391946 is an apocalyptic number.

8391946 is a deficient number, since it is larger than the sum of its proper divisors (4195976).

8391946 is a wasteful number, since it uses less digits than its factorization.

8391946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4195975.

The product of its digits is 46656, while the sum is 40.

The square root of 8391946 is about 2896.8855690206. The cubic root of 8391946 is about 203.2142818872.

It can be divided in two parts, 83 and 91946, that added together give a palindrome (92029).

The spelling of 8391946 in words is "eight million, three hundred ninety-one thousand, nine hundred forty-six".