8191438 has 4 divisors (see below), whose sum is σ = 12287160. Its totient is φ = 4095718.

The previous prime is 8191423. The next prime is 8191441. The reversal of 8191438 is 8341918.

It is a happy number.

8191438 is nontrivially palindromic in base 6.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2047858 + ... + 2047861.

It is an arithmetic number, because the mean of its divisors is an integer number (3071790).

Almost surely, 2^8191438 is an apocalyptic number.

8191438 is a deficient number, since it is larger than the sum of its proper divisors (4095722).

8191438 is a wasteful number, since it uses less digits than its factorization.

8191438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4095721.

The product of its digits is 6912, while the sum is 34.

The square root of 8191438 is about 2862.0688321562. The cubic root of 8191438 is about 201.5827580104.

It can be divided in two parts, 81 and 91438, that added together give a palindrome (91519).

The spelling of 8191438 in words is "eight million, one hundred ninety-one thousand, four hundred thirty-eight".