861023 has 4 divisors (see below), whose sum is σ = 906360. Its totient is φ = 815688.

The previous prime is 861019. The next prime is 861031. The reversal of 861023 is 320168.

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

It is a cyclic number.

It is not a de Polignac number, because 861023 - 2² = 861019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 860986 and 861004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22640 + ... + 22677.

It is an arithmetic number, because the mean of its divisors is an integer number (226590).

2⁸⁶¹⁰²³ is an apocalyptic number.

861023 is a deficient number, since it is larger than the sum of its proper divisors (45337).

861023 is a wasteful number, since it uses less digits than its factorization.

861023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45336.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 861023 is about 927.9132502556. The cubic root of 861023 is about 95.1345461976.

It can be divided in two parts, 86 and 1023, that multiplied together give a palindrome (87978).

The spelling of 861023 in words is "eight hundred sixty-one thousand, twenty-three".