861022 has 4 divisors (see below), whose sum is σ = 1291536. Its totient is φ = 430510.

The previous prime is 861019. The next prime is 861031. The reversal of 861022 is 220168.

It is a happy number.

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

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, 215254 + ... + 215257.

It is an arithmetic number, because the mean of its divisors is an integer number (322884).

2⁸⁶¹⁰²² is an apocalyptic number.

861022 is a deficient number, since it is larger than the sum of its proper divisors (430514).

861022 is a wasteful number, since it uses less digits than its factorization.

861022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430513.

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

The square root of 861022 is about 927.9127114120. The cubic root of 861022 is about 95.1345093676.

It can be divided in two parts, 8610 and 22, that multiplied together give a triangular number (189420 = T₆₁₅).

The spelling of 861022 in words is "eight hundred sixty-one thousand, twenty-two".