8640123 has 4 divisors (see below), whose sum is σ = 11520168. Its totient is φ = 5760080.

The previous prime is 8640109. The next prime is 8640133. The reversal of 8640123 is 3210468.

It is a happy number.

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 8640123 - 2⁶ = 8640059 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8640093 and 8640102.

It is not an unprimeable number, because it can be changed into a prime (8640133) 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, 1440018 + ... + 1440023.

It is an arithmetic number, because the mean of its divisors is an integer number (2880042).

Almost surely, 2^8640123 is an apocalyptic number.

8640123 is a deficient number, since it is larger than the sum of its proper divisors (2880045).

8640123 is a wasteful number, since it uses less digits than its factorization.

8640123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2880044.

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

The square root of 8640123 is about 2939.4086139902. The cubic root of 8640123 is about 205.1980873329.

The spelling of 8640123 in words is "eight million, six hundred forty thousand, one hundred twenty-three".