861004 has 12 divisors (see below), whose sum is σ = 1586200. Its totient is φ = 407808.

The previous prime is 861001. The next prime is 861013. The reversal of 861004 is 400168.

It is a Harshad number since it is a multiple of its sum of digits (19).

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 in 3 ways as a sum of consecutive naturals, for example, 5589 + ... + 5740.

2⁸⁶¹⁰⁰⁴ is an apocalyptic number.

It is an amenable number.

861004 is a deficient number, since it is larger than the sum of its proper divisors (725196).

861004 is a wasteful number, since it uses less digits than its factorization.

861004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11352 (or 11350 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 861004 is about 927.9030121731. The cubic root of 861004 is about 95.1338464216.

The spelling of 861004 in words is "eight hundred sixty-one thousand, four".