8404427 has 2 divisors, whose sum is σ = 8404428. Its totient is φ = 8404426.

The previous prime is 8404411. The next prime is 8404433. The reversal of 8404427 is 7244048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8404427 - 2⁴ = 8404411 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8404427.

It is not a weakly prime, because it can be changed into another prime (8404127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4202213 + 4202214.

It is an arithmetic number, because the mean of its divisors is an integer number (4202214).

Almost surely, 2^8404427 is an apocalyptic number.

8404427 is a deficient number, since it is larger than the sum of its proper divisors (1).

8404427 is an equidigital number, since it uses as much as digits as its factorization.

8404427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 8404427 is about 2899.0389786962. The cubic root of 8404427 is about 203.3149760966.

The spelling of 8404427 in words is "eight million, four hundred four thousand, four hundred twenty-seven".