123678 has 12 divisors (see below), whose sum is σ = 268008. Its totient is φ = 41220.

The previous prime is 123677. The next prime is 123701. The reversal of 123678 is 876321.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123677) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3418 + ... + 3453.

It is an arithmetic number, because the mean of its divisors is an integer number (22334).

2¹²³⁶⁷⁸ is an apocalyptic number.

123678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

123678 is an abundant number, since it is smaller than the sum of its proper divisors (144330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123678 is a wasteful number, since it uses less digits than its factorization.

123678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6879 (or 6876 counting only the distinct ones).

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

The square root of 123678 is about 351.6788307533. The cubic root of 123678 is about 49.8231082576.

Adding to 123678 its reverse (876321), we get a palindrome (999999).

The spelling of 123678 in words is "one hundred twenty-three thousand, six hundred seventy-eight".