861825 has 12 divisors (see below), whose sum is σ = 1425008. Its totient is φ = 459600.

The previous prime is 861823. The next prime is 861829. The reversal of 861825 is 528168.

It is not a de Polignac number, because 861825 - 2¹ = 861823 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 861792 and 861801.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 861825.

It is not an unprimeable number, because it can be changed into a prime (861823) 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, 5671 + ... + 5820.

2⁸⁶¹⁸²⁵ is an apocalyptic number.

It is an amenable number.

861825 is a deficient number, since it is larger than the sum of its proper divisors (563183).

861825 is a wasteful number, since it uses less digits than its factorization.

861825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11504 (or 11499 counting only the distinct ones).

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

The square root of 861825 is about 928.3453021371. The cubic root of 861825 is about 95.1640747271.

The spelling of 861825 in words is "eight hundred sixty-one thousand, eight hundred twenty-five".