861219 has 16 divisors (see below), whose sum is σ = 1290240. Its totient is φ = 567720.

The previous prime is 861199. The next prime is 861221. The reversal of 861219 is 912168.

It is a de Polignac number, because none of the positive numbers 2^k-861219 is a prime.

It is a super-2 number, since 2×861219² = 1483396331922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 861192 and 861201.

It is not an unprimeable number, because it can be changed into a prime (861239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4414 + ... + 4604.

It is an arithmetic number, because the mean of its divisors is an integer number (80640).

2⁸⁶¹²¹⁹ is an apocalyptic number.

861219 is a deficient number, since it is larger than the sum of its proper divisors (429021).

861219 is a wasteful number, since it uses less digits than its factorization.

861219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367 (or 361 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 861219 is about 928.0188575670. The cubic root of 861219 is about 95.1417643387.

The spelling of 861219 in words is "eight hundred sixty-one thousand, two hundred nineteen".