123878 has 8 divisors (see below), whose sum is σ = 193968. Its totient is φ = 59224.

The previous prime is 123863. The next prime is 123887. The reversal of 123878 is 878321.

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

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

It is a self number, because there is not a number n which added to its sum of digits gives 123878.

It is a congruent number.

It is an unprimeable number.

123878 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 3 ways as a sum of consecutive naturals, for example, 1301 + ... + 1392.

It is an arithmetic number, because the mean of its divisors is an integer number (24246).

2¹²³⁸⁷⁸ is an apocalyptic number.

123878 is a deficient number, since it is larger than the sum of its proper divisors (70090).

123878 is a wasteful number, since it uses less digits than its factorization.

123878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2718.

The product of its digits is 2688, while the sum is 29.

The square root of 123878 is about 351.9630662442. The cubic root of 123878 is about 49.8499501513.

It can be divided in two parts, 123 and 878, that added together give a palindrome (1001).

The spelling of 123878 in words is "one hundred twenty-three thousand, eight hundred seventy-eight".