864123 has 8 divisors (see below), whose sum is σ = 1240848. Its totient is φ = 531744.

The previous prime is 864121. The next prime is 864131. The reversal of 864123 is 321468.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 864123 - 2¹ = 864121 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 864093 and 864102.

It is not an unprimeable number, because it can be changed into a prime (864121) 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, 11040 + ... + 11117.

It is an arithmetic number, because the mean of its divisors is an integer number (155106).

2⁸⁶⁴¹²³ is an apocalyptic number.

864123 is a deficient number, since it is larger than the sum of its proper divisors (376725).

864123 is a wasteful number, since it uses less digits than its factorization.

864123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22173.

The product of its digits is 1152, while the sum is 24.

The square root of 864123 is about 929.5821642007. The cubic root of 864123 is about 95.2485825872.

The spelling of 864123 in words is "eight hundred sixty-four thousand, one hundred twenty-three".