678123 has 6 divisors (see below), whose sum is σ = 979524. Its totient is φ = 452076.

The previous prime is 678103. The next prime is 678133. The reversal of 678123 is 321876.

It is not a de Polignac number, because 678123 - 2¹³ = 669931 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (678103) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 37665 + ... + 37682.

It is an arithmetic number, because the mean of its divisors is an integer number (163254).

2⁶⁷⁸¹²³ is an apocalyptic number.

678123 is a deficient number, since it is larger than the sum of its proper divisors (301401).

678123 is a wasteful number, since it uses less digits than its factorization.

678123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75353 (or 75350 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 678123 is about 823.4822402457. The cubic root of 678123 is about 87.8556085962.

Adding to 678123 its reverse (321876), we get a palindrome (999999).

The spelling of 678123 in words is "six hundred seventy-eight thousand, one hundred twenty-three".