123478 has 8 divisors (see below), whose sum is σ = 187272. Its totient is φ = 61056.

The previous prime is 123457. The next prime is 123479. The reversal of 123478 is 874321.

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

It is an Ulam number.

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

It is a plaindrome in base 10 and base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123479) by changing a digit.

123478 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75 + ... + 502.

It is an arithmetic number, because the mean of its divisors is an integer number (23409).

2¹²³⁴⁷⁸ is an apocalyptic number.

123478 is a deficient number, since it is larger than the sum of its proper divisors (63794).

123478 is a wasteful number, since it uses less digits than its factorization.

123478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686.

The product of its digits is 1344, while the sum is 25.

The square root of 123478 is about 351.3943653504. The cubic root of 123478 is about 49.7962374108.

Adding to 123478 its reverse (874321), we get a palindrome (997799).

The spelling of 123478 in words is "one hundred twenty-three thousand, four hundred seventy-eight".