861495 has 16 divisors (see below), whose sum is σ = 1397760. Its totient is φ = 453024.

The previous prime is 861493. The next prime is 861499. The reversal of 861495 is 594168.

It is not a de Polignac number, because 861495 - 2¹ = 861493 is a prime.

861495 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861491) 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, 822 + ... + 1548.

It is an arithmetic number, because the mean of its divisors is an integer number (87360).

2⁸⁶¹⁴⁹⁵ is an apocalyptic number.

861495 is a deficient number, since it is larger than the sum of its proper divisors (536265).

861495 is a wasteful number, since it uses less digits than its factorization.

861495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814.

The product of its digits is 8640, while the sum is 33.

The square root of 861495 is about 928.1675495297. The cubic root of 861495 is about 95.1519268031.

The spelling of 861495 in words is "eight hundred sixty-one thousand, four hundred ninety-five".