816427 has 2 divisors, whose sum is σ = 816428. Its totient is φ = 816426.

The previous prime is 816401. The next prime is 816443. The reversal of 816427 is 724618.

816427 is nontrivially palindromic in base 5.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 816427 - 2¹¹ = 814379 is a prime.

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 816395 and 816404.

It is not a weakly prime, because it can be changed into another prime (816227) 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, 408213 + 408214.

It is an arithmetic number, because the mean of its divisors is an integer number (408214).

2⁸¹⁶⁴²⁷ is an apocalyptic number.

816427 is a deficient number, since it is larger than the sum of its proper divisors (1).

816427 is an equidigital number, since it uses as much as digits as its factorization.

816427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 28.

The square root of 816427 is about 903.5635008122. The cubic root of 816427 is about 93.4628714337.

Subtracting from 816427 its reverse (724618), we obtain a square (91809 = 303²).

The spelling of 816427 in words is "eight hundred sixteen thousand, four hundred twenty-seven".