816825 has 12 divisors (see below), whose sum is σ = 1350608. Its totient is φ = 435600.

The previous prime is 816821. The next prime is 816839. The reversal of 816825 is 528618.

It is not a de Polignac number, because 816825 - 2² = 816821 is a prime.

It is a Duffinian number.

816825 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 816792 and 816801.

It is not an unprimeable number, because it can be changed into a prime (816821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5371 + ... + 5520.

2⁸¹⁶⁸²⁵ is an apocalyptic number.

It is an amenable number.

816825 is a deficient number, since it is larger than the sum of its proper divisors (533783).

816825 is a wasteful number, since it uses less digits than its factorization.

816825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10904 (or 10899 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 816825 is about 903.7837130641. The cubic root of 816825 is about 93.4780563716.

The spelling of 816825 in words is "eight hundred sixteen thousand, eight hundred twenty-five".