861245 has 16 divisors (see below), whose sum is σ = 1289088. Its totient is φ = 536640.

The previous prime is 861239. The next prime is 861293. The reversal of 861245 is 542168.

861245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 861245 - 2¹⁴ = 844861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 734 + ... + 1503.

It is an arithmetic number, because the mean of its divisors is an integer number (80568).

2⁸⁶¹²⁴⁵ is an apocalyptic number.

It is an amenable number.

861245 is a deficient number, since it is larger than the sum of its proper divisors (427843).

861245 is a wasteful number, since it uses less digits than its factorization.

861245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260.

The product of its digits is 1920, while the sum is 26.

The square root of 861245 is about 928.0328657973. The cubic root of 861245 is about 95.1427217649.

It can be divided in two parts, 86 and 1245, that added together give a palindrome (1331).

The spelling of 861245 in words is "eight hundred sixty-one thousand, two hundred forty-five".