8391938 has 4 divisors (see below), whose sum is σ = 12587910. Its totient is φ = 4195968.

The previous prime is 8391937. The next prime is 8391947.

8391938 is nontrivially palindromic in base 10.

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., 7006609 + 1385329 = 2647^2 + 1177^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8391895 and 8391904.

It is not an unprimeable number, because it can be changed into a prime (8391937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2097983 + ... + 2097986.

Almost surely, 2^8391938 is an apocalyptic number.

8391938 is a deficient number, since it is larger than the sum of its proper divisors (4195972).

8391938 is a wasteful number, since it uses less digits than its factorization.

8391938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4195971.

The product of its digits is 46656, while the sum is 41.

The square root of 8391938 is about 2896.8841882271. The cubic root of 8391938 is about 203.2142173128.

The spelling of 8391938 in words is "eight million, three hundred ninety-one thousand, nine hundred thirty-eight".