8427391 has 4 divisors (see below), whose sum is σ = 9631312. Its totient is φ = 7223472.

The previous prime is 8427337. The next prime is 8427401. The reversal of 8427391 is 1937248.

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 8427391 - 2²³ = 38783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8427311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 601950 + ... + 601963.

It is an arithmetic number, because the mean of its divisors is an integer number (2407828).

Almost surely, 2^8427391 is an apocalyptic number.

8427391 is a deficient number, since it is larger than the sum of its proper divisors (1203921).

8427391 is a wasteful number, since it uses less digits than its factorization.

8427391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203920.

The product of its digits is 12096, while the sum is 34.

The square root of 8427391 is about 2902.9968997572. The cubic root of 8427391 is about 203.4999849078.

The spelling of 8427391 in words is "eight million, four hundred twenty-seven thousand, three hundred ninety-one".