861259 has 8 divisors (see below), whose sum is σ = 1000928. Its totient is φ = 725760.

The previous prime is 861239. The next prime is 861293. The reversal of 861259 is 952168.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 861259 - 2⁷ = 861131 is a prime.

It is a Duffinian number.

861259 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 861259.

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 7 ways as a sum of consecutive naturals, for example, 582 + ... + 1435.

It is an arithmetic number, because the mean of its divisors is an integer number (125116).

2⁸⁶¹²⁵⁹ is an apocalyptic number.

861259 is a deficient number, since it is larger than the sum of its proper divisors (139669).

861259 is a wasteful number, since it uses less digits than its factorization.

861259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2085.

The product of its digits is 4320, while the sum is 31.

The square root of 861259 is about 928.0404086030. The cubic root of 861259 is about 95.1432372941.

Subtracting 861259 from its reverse (952168), we obtain a palindrome (90909).

The spelling of 861259 in words is "eight hundred sixty-one thousand, two hundred fifty-nine".