816447 has 8 divisors (see below), whose sum is σ = 1123840. Its totient is φ = 526680.

The previous prime is 816443. The next prime is 816451. The reversal of 816447 is 744618.

It is an interprime number because it is at equal distance from previous prime (816443) and next prime (816451).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 816447 - 2² = 816443 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 (816443) 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 7 ways as a sum of consecutive naturals, for example, 4297 + ... + 4482.

It is an arithmetic number, because the mean of its divisors is an integer number (140480).

2⁸¹⁶⁴⁴⁷ is an apocalyptic number.

816447 is a deficient number, since it is larger than the sum of its proper divisors (307393).

816447 is a wasteful number, since it uses less digits than its factorization.

816447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8813.

The product of its digits is 5376, while the sum is 30.

The square root of 816447 is about 903.5745680352. The cubic root of 816447 is about 93.4636346136.

The spelling of 816447 in words is "eight hundred sixteen thousand, four hundred forty-seven".