861595 has 16 divisors (see below), whose sum is σ = 1198080. Its totient is φ = 582624.

The previous prime is 861589. The next prime is 861599. The reversal of 861595 is 595168.

It is not a de Polignac number, because 861595 - 2⁵ = 861563 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 861595.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3486 + ... + 3724.

It is an arithmetic number, because the mean of its divisors is an integer number (74880).

2⁸⁶¹⁵⁹⁵ is an apocalyptic number.

861595 is a deficient number, since it is larger than the sum of its proper divisors (336485).

861595 is a wasteful number, since it uses less digits than its factorization.

861595 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354.

The product of its digits is 10800, while the sum is 34.

The square root of 861595 is about 928.2214175508. The cubic root of 861595 is about 95.1556083197.

It can be divided in two parts, 86 and 1595, that added together give a square (1681 = 41²).

The spelling of 861595 in words is "eight hundred sixty-one thousand, five hundred ninety-five".