861236 has 6 divisors (see below), whose sum is σ = 1507170. Its totient is φ = 430616.

The previous prime is 861221. The next prime is 861239. The reversal of 861236 is 632168.

It can be written as a sum of positive squares in only one way, i.e., 649636 + 211600 = 806^2 + 460^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107651 + ... + 107658.

It is an arithmetic number, because the mean of its divisors is an integer number (251195).

2⁸⁶¹²³⁶ is an apocalyptic number.

It is an amenable number.

861236 is a deficient number, since it is larger than the sum of its proper divisors (645934).

861236 is a wasteful number, since it uses less digits than its factorization.

861236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215313 (or 215311 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 861236 is about 928.0280168185. The cubic root of 861236 is about 95.1423903503.

The spelling of 861236 in words is "eight hundred sixty-one thousand, two hundred thirty-six".