678040123 has 2 divisors, whose sum is σ = 678040124. Its totient is φ = 678040122.

The previous prime is 678040109. The next prime is 678040127. The reversal of 678040123 is 321040876.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 678040123 - 2¹³ = 678031931 is a prime.

It is equal to p_35173570 and since 678040123 and 35173570 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (678040127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339020061 + 339020062.

It is an arithmetic number, because the mean of its divisors is an integer number (339020062).

Almost surely, 2^678040123 is an apocalyptic number.

678040123 is a deficient number, since it is larger than the sum of its proper divisors (1).

678040123 is an equidigital number, since it uses as much as digits as its factorization.

678040123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 678040123 is about 26039.2035784507. The cubic root of 678040123 is about 878.5202935078.

Adding to 678040123 its reverse (321040876), we get a palindrome (999080999).

The spelling of 678040123 in words is "six hundred seventy-eight million, forty thousand, one hundred twenty-three".