861886 has 16 divisors (see below), whose sum is σ = 1353024. Its totient is φ = 411424.

The previous prime is 861881. The next prime is 861899. The reversal of 861886 is 688168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4896 + ... + 5068.

It is an arithmetic number, because the mean of its divisors is an integer number (84564).

2⁸⁶¹⁸⁸⁶ is an apocalyptic number.

861886 is a deficient number, since it is larger than the sum of its proper divisors (491138).

861886 is a wasteful number, since it uses less digits than its factorization.

861886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275.

The product of its digits is 18432, while the sum is 37.

The square root of 861886 is about 928.3781557103. The cubic root of 861886 is about 95.1663199128.

The spelling of 861886 in words is "eight hundred sixty-one thousand, eight hundred eighty-six".