861210 has 48 divisors (see below), whose sum is σ = 2560896. Its totient is φ = 196704.

The previous prime is 861199. The next prime is 861221. The reversal of 861210 is 12168.

It is an interprime number because it is at equal distance from previous prime (861199) and next prime (861221).

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

It is an unprimeable number.

861210 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54 + ... + 1313.

It is an arithmetic number, because the mean of its divisors is an integer number (53352).

2⁸⁶¹²¹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1280448).

861210 is an abundant number, since it is smaller than the sum of its proper divisors (1699686).

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

861210 is a wasteful number, since it uses less digits than its factorization.

861210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387 (or 1384 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 861210 is about 928.0140085150. The cubic root of 861210 is about 95.1414329174.

Adding to 861210 its reverse (12168), we get a palindrome (873378).

It can be divided in two parts, 86 and 1210, that added together give a 4-th power (1296 = 6⁴).

The spelling of 861210 in words is "eight hundred sixty-one thousand, two hundred ten".