816925 has 12 divisors (see below), whose sum is σ = 1038996. Its totient is φ = 636800.

The previous prime is 816919. The next prime is 816929. The reversal of 816925 is 529618.

It can be written as a sum of positive squares in 6 ways, for example, as 142884 + 674041 = 378^2 + 821^2 .

It is not a de Polignac number, because 816925 - 2³ = 816917 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816929) 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, 627 + ... + 1423.

It is an arithmetic number, because the mean of its divisors is an integer number (86583).

2⁸¹⁶⁹²⁵ is an apocalyptic number.

It is an amenable number.

816925 is a deficient number, since it is larger than the sum of its proper divisors (222071).

816925 is a wasteful number, since it uses less digits than its factorization.

816925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848 (or 843 counting only the distinct ones).

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

The square root of 816925 is about 903.8390343418. The cubic root of 816925 is about 93.4818709072.

The spelling of 816925 in words is "eight hundred sixteen thousand, nine hundred twenty-five".