816287 has 4 divisors (see below), whose sum is σ = 827856. Its totient is φ = 804720.

The previous prime is 816271. The next prime is 816317. The reversal of 816287 is 782618.

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 816287 - 2⁴ = 816271 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5678 + ... + 5819.

It is an arithmetic number, because the mean of its divisors is an integer number (206964).

2⁸¹⁶²⁸⁷ is an apocalyptic number.

816287 is a deficient number, since it is larger than the sum of its proper divisors (11569).

816287 is a wasteful number, since it uses less digits than its factorization.

816287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11568.

The product of its digits is 5376, while the sum is 32.

The square root of 816287 is about 903.4860264553. The cubic root of 816287 is about 93.4575288250.

The spelling of 816287 in words is "eight hundred sixteen thousand, two hundred eighty-seven".