861265 has 8 divisors (see below), whose sum is σ = 1038888. Its totient is φ = 685440.

The previous prime is 861239. The next prime is 861293. The reversal of 861265 is 562168.

It can be written as a sum of positive squares in 4 ways, for example, as 1936 + 859329 = 44^2 + 927^2 .

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

It is not a de Polignac number, because 861265 - 2⁹ = 860753 is a prime.

It is a Duffinian number.

861265 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1099 + ... + 1711.

It is an arithmetic number, because the mean of its divisors is an integer number (129861).

2⁸⁶¹²⁶⁵ is an apocalyptic number.

It is an amenable number.

861265 is a deficient number, since it is larger than the sum of its proper divisors (177623).

861265 is a wasteful number, since it uses less digits than its factorization.

861265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899.

The product of its digits is 2880, while the sum is 28.

The square root of 861265 is about 928.0436412152. The cubic root of 861265 is about 95.1434582335.

The spelling of 861265 in words is "eight hundred sixty-one thousand, two hundred sixty-five".