8148391 has 4 divisors (see below), whose sum is σ = 8429400. Its totient is φ = 7867384.

The previous prime is 8148373. The next prime is 8148401. The reversal of 8148391 is 1938418.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 8148391 - 2⁷ = 8148263 is a prime.

It is a Duffinian number.

8148391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8148311) 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, 140461 + ... + 140518.

It is an arithmetic number, because the mean of its divisors is an integer number (2107350).

Almost surely, 2^8148391 is an apocalyptic number.

8148391 is a deficient number, since it is larger than the sum of its proper divisors (281009).

8148391 is a wasteful number, since it uses less digits than its factorization.

8148391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281008.

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

The square root of 8148391 is about 2854.5386667551. The cubic root of 8148391 is about 201.2290237001.

The spelling of 8148391 in words is "eight million, one hundred forty-eight thousand, three hundred ninety-one".