123103656 has 144 divisors (see below), whose sum is σ = 368840160. Its totient is φ = 37065600.

The previous prime is 123103639. The next prime is 123103661. The reversal of 123103656 is 656301321.

123103656 is a `hidden beast` number, since 1 + 2 + 3 + 1 + 0 + 3 + 656 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 815181 + ... + 815331.

It is an arithmetic number, because the mean of its divisors is an integer number (2561390).

Almost surely, 2^123103656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123103656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184420080).

123103656 is an abundant number, since it is smaller than the sum of its proper divisors (245736504).

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

123103656 is a wasteful number, since it uses less digits than its factorization.

123103656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256 (or 236 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 123103656 is about 11095.2086956488. The cubic root of 123103656 is about 497.4586462600.

Adding to 123103656 its reverse (656301321), we get a palindrome (779404977).

The spelling of 123103656 in words is "one hundred twenty-three million, one hundred three thousand, six hundred fifty-six".