861030 has 40 divisors (see below), whose sum is σ = 2317392. Its totient is φ = 229392.

The previous prime is 861019. The next prime is 861031. The reversal of 861030 is 30168.

861030 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 860994 and 861012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861031) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 279 + ... + 1341.

2⁸⁶¹⁰³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1158696).

861030 is an abundant number, since it is smaller than the sum of its proper divisors (1456362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861030 is a wasteful number, since it uses less digits than its factorization.

861030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082 (or 1073 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 861030 is about 927.9170221523. The cubic root of 861030 is about 95.1348040072.

Adding to 861030 its reverse (30168), we get a palindrome (891198).

The spelling of 861030 in words is "eight hundred sixty-one thousand, thirty".