123145678 has 4 divisors (see below), whose sum is σ = 184718520. Its totient is φ = 61572838.

The previous prime is 123145661. The next prime is 123145681. The reversal of 123145678 is 876541321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 876541321 = 4871 ⋅179951.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30786418 + ... + 30786421.

It is an arithmetic number, because the mean of its divisors is an integer number (46179630).

Almost surely, 2^123145678 is an apocalyptic number.

123145678 is a deficient number, since it is larger than the sum of its proper divisors (61572842).

123145678 is an equidigital number, since it uses as much as digits as its factorization.

123145678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61572841.

The product of its digits is 40320, while the sum is 37.

The square root of 123145678 is about 11097.1022343673. The cubic root of 123145678 is about 497.5152430874.

Adding to 123145678 its reverse (876541321), we get a palindrome (999686999).

The spelling of 123145678 in words is "one hundred twenty-three million, one hundred forty-five thousand, six hundred seventy-eight".