861956 has 12 divisors (see below), whose sum is σ = 1516620. Its totient is φ = 428640.

The previous prime is 861947. The next prime is 861977. The reversal of 861956 is 659168.

It can be written as a sum of positive squares in 2 ways, for example, as 688900 + 173056 = 830^2 + 416^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446 + ... + 1386.

It is an arithmetic number, because the mean of its divisors is an integer number (126385).

2⁸⁶¹⁹⁵⁶ is an apocalyptic number.

It is an amenable number.

861956 is a deficient number, since it is larger than the sum of its proper divisors (654664).

861956 is a wasteful number, since it uses less digits than its factorization.

861956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174 (or 1172 counting only the distinct ones).

The product of its digits is 12960, while the sum is 35.

The square root of 861956 is about 928.4158550994. The cubic root of 861956 is about 95.1688962250.

The spelling of 861956 in words is "eight hundred sixty-one thousand, nine hundred fifty-six".