825669 has 12 divisors (see below), whose sum is σ = 1284556. Its totient is φ = 508032.

The previous prime is 825661. The next prime is 825679. The reversal of 825669 is 966528.

It can be written as a sum of positive squares in 2 ways, for example, as 562500 + 263169 = 750^2 + 513^2 .

It is not a de Polignac number, because 825669 - 2³ = 825661 is a prime.

It is a super-2 number, since 2×825669² = 1363458595122, which contains 22 as substring.

825669 is a lucky number.

It is a plaindrome in base 12 and base 15.

It is a zygodrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825661) 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, 3412 + ... + 3645.

2⁸²⁵⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

825669 is a deficient number, since it is larger than the sum of its proper divisors (458887).

825669 is a wasteful number, since it uses less digits than its factorization.

825669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7076 (or 7073 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 825669 is about 908.6633039801. The cubic root of 825669 is about 93.8142173354.

The spelling of 825669 in words is "eight hundred twenty-five thousand, six hundred sixty-nine".