861829 has 2 divisors, whose sum is σ = 861830. Its totient is φ = 861828.

The previous prime is 861823. The next prime is 861853. The reversal of 861829 is 928168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 859329 + 2500 = 927^2 + 50^2 .

It is a cyclic number.

It is not a de Polignac number, because 861829 - 2⁵ = 861797 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 861794 and 861803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430914 + 430915.

It is an arithmetic number, because the mean of its divisors is an integer number (430915).

2⁸⁶¹⁸²⁹ is an apocalyptic number.

It is an amenable number.

861829 is a deficient number, since it is larger than the sum of its proper divisors (1).

861829 is an equidigital number, since it uses as much as digits as its factorization.

861829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 34.

The square root of 861829 is about 928.3474565054. The cubic root of 861829 is about 95.1642219556.

The spelling of 861829 in words is "eight hundred sixty-one thousand, eight hundred twenty-nine".