861045 has 16 divisors (see below), whose sum is σ = 1391040. Its totient is φ = 454784.

The previous prime is 861043. The next prime is 861053. The reversal of 861045 is 540168.

It is a cyclic number.

It is not a de Polignac number, because 861045 - 2¹ = 861043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861043) 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, 1846 + ... + 2264.

It is an arithmetic number, because the mean of its divisors is an integer number (86940).

2⁸⁶¹⁰⁴⁵ is an apocalyptic number.

It is an amenable number.

861045 is a deficient number, since it is larger than the sum of its proper divisors (529995).

861045 is a wasteful number, since it uses less digits than its factorization.

861045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 861045 is about 927.9251047364. The cubic root of 861045 is about 95.1353564517.

The spelling of 861045 in words is "eight hundred sixty-one thousand, forty-five".