861142 has 4 divisors (see below), whose sum is σ = 1291716. Its totient is φ = 430570.

The previous prime is 861139. The next prime is 861163. The reversal of 861142 is 241168.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215284 + ... + 215287.

It is an arithmetic number, because the mean of its divisors is an integer number (322929).

2⁸⁶¹¹⁴² is an apocalyptic number.

861142 is a deficient number, since it is larger than the sum of its proper divisors (430574).

861142 is a wasteful number, since it uses less digits than its factorization.

861142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430573.

The product of its digits is 384, while the sum is 22.

The square root of 861142 is about 927.9773704137. The cubic root of 861142 is about 95.1389287710.

The spelling of 861142 in words is "eight hundred sixty-one thousand, one hundred forty-two".