861008 has 10 divisors (see below), whose sum is σ = 1668234. Its totient is φ = 430496.

The previous prime is 861001. The next prime is 861013. The reversal of 861008 is 800168.

It can be written as a sum of positive squares in only one way, i.e., 753424 + 107584 = 868^2 + 328^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26891 + ... + 26922.

2⁸⁶¹⁰⁰⁸ is an apocalyptic number.

It is an amenable number.

861008 is a deficient number, since it is larger than the sum of its proper divisors (807226).

861008 is a wasteful number, since it uses less digits than its factorization.

861008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53821 (or 53815 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 861008 is about 927.9051675683. The cubic root of 861008 is about 95.1339937438.

It can be divided in two parts, 8 and 61008, that added together give a palindrome (61016).

The spelling of 861008 in words is "eight hundred sixty-one thousand, eight".