816259 has 4 divisors (see below), whose sum is σ = 859240. Its totient is φ = 773280.

The previous prime is 816251. The next prime is 816271. The reversal of 816259 is 952618.

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 816259 - 2³ = 816251 is a prime.

It is a Duffinian number.

816259 is a lucky number.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 816259.

It is not an unprimeable number, because it can be changed into a prime (816251) 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, 21462 + ... + 21499.

It is an arithmetic number, because the mean of its divisors is an integer number (214810).

2⁸¹⁶²⁵⁹ is an apocalyptic number.

816259 is a deficient number, since it is larger than the sum of its proper divisors (42981).

816259 is a wasteful number, since it uses less digits than its factorization.

816259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42980.

The product of its digits is 4320, while the sum is 31.

The square root of 816259 is about 903.4705307867. The cubic root of 816259 is about 93.4564602299.

The spelling of 816259 in words is "eight hundred sixteen thousand, two hundred fifty-nine".