123136456 has 32 divisors (see below), whose sum is σ = 235599840. Its totient is φ = 60323328.

The previous prime is 123136451. The next prime is 123136471. The reversal of 123136456 is 654631321.

It is not an unprimeable number, because it can be changed into a prime (123136451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82291 + ... + 83773.

It is an arithmetic number, because the mean of its divisors is an integer number (7362495).

Almost surely, 2^123136456 is an apocalyptic number.

It is an amenable number.

123136456 is a deficient number, since it is larger than the sum of its proper divisors (112463384).

123136456 is a wasteful number, since it uses less digits than its factorization.

123136456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1693 (or 1689 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 123136456 is about 11096.6867127084. The cubic root of 123136456 is about 497.5028236500.

Adding to 123136456 its reverse (654631321), we get a palindrome (777767777).

It can be divided in two parts, 12313 and 6456, that added together give a square (18769 = 137²).

The spelling of 123136456 in words is "one hundred twenty-three million, one hundred thirty-six thousand, four hundred fifty-six".