861650 has 24 divisors (see below), whose sum is σ = 1688880. Its totient is φ = 326160.

The previous prime is 861647. The next prime is 861659. The reversal of 861650 is 56168.

861650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (861659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 497 + ... + 1403.

It is an arithmetic number, because the mean of its divisors is an integer number (70370).

2⁸⁶¹⁶⁵⁰ is an apocalyptic number.

861650 is a deficient number, since it is larger than the sum of its proper divisors (827230).

861650 is a wasteful number, since it uses less digits than its factorization.

861650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938 (or 933 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 861650 is about 928.2510436299. The cubic root of 861650 is about 95.1576330325.

The spelling of 861650 in words is "eight hundred sixty-one thousand, six hundred fifty".