861994 has 16 divisors (see below), whose sum is σ = 1542528. Its totient is φ = 353232.

The previous prime is 861979. The next prime is 861997. The reversal of 861994 is 499168.

861994 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 (861997) 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, 1017 + ... + 1660.

It is an arithmetic number, because the mean of its divisors is an integer number (96408).

2⁸⁶¹⁹⁹⁴ is an apocalyptic number.

861994 is a deficient number, since it is larger than the sum of its proper divisors (680534).

861994 is a wasteful number, since it uses less digits than its factorization.

861994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2709.

The product of its digits is 15552, while the sum is 37.

The square root of 861994 is about 928.4363198411. The cubic root of 861994 is about 95.1702947360.

It can be divided in two parts, 86 and 1994, that added together give a triangular number (2080 = T₆₄).

The spelling of 861994 in words is "eight hundred sixty-one thousand, nine hundred ninety-four".