816423 has 4 divisors (see below), whose sum is σ = 1088568. Its totient is φ = 544280.

The previous prime is 816401. The next prime is 816427. The reversal of 816423 is 324618.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816423 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 816393 and 816402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816427) 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 in 3 ways as a sum of consecutive naturals, for example, 136068 + ... + 136073.

It is an arithmetic number, because the mean of its divisors is an integer number (272142).

2⁸¹⁶⁴²³ is an apocalyptic number.

816423 is a deficient number, since it is larger than the sum of its proper divisors (272145).

816423 is a wasteful number, since it uses less digits than its factorization.

816423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272144.

The product of its digits is 1152, while the sum is 24.

The square root of 816423 is about 903.5612873513. The cubic root of 816423 is about 93.4627187962.

The spelling of 816423 in words is "eight hundred sixteen thousand, four hundred twenty-three".