8399427 has 4 divisors (see below), whose sum is σ = 11199240. Its totient is φ = 5599616.

The previous prime is 8399423. The next prime is 8399429. The reversal of 8399427 is 7249938.

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 8399427 - 2² = 8399423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8399423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1399902 + ... + 1399907.

It is an arithmetic number, because the mean of its divisors is an integer number (2799810).

Almost surely, 2^8399427 is an apocalyptic number.

8399427 is a deficient number, since it is larger than the sum of its proper divisors (2799813).

8399427 is a wasteful number, since it uses less digits than its factorization.

8399427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2799812.

The product of its digits is 108864, while the sum is 42.

The square root of 8399427 is about 2898.1764956607. The cubic root of 8399427 is about 203.2746490744.

The spelling of 8399427 in words is "eight million, three hundred ninety-nine thousand, four hundred twenty-seven".