13123656 has 96 divisors (see below), whose sum is σ = 43767360. Its totient is φ = 3459456.

The previous prime is 13123603. The next prime is 13123679. The reversal of 13123656 is 65632131.

13123656 is a `hidden beast` number, since 1 + 3 + 1 + 2 + 3 + 656 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5551 + ... + 7553.

It is an arithmetic number, because the mean of its divisors is an integer number (455910).

Almost surely, 2^13123656 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 13123656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21883680).

13123656 is an abundant number, since it is smaller than the sum of its proper divisors (30643704).

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

13123656 is a wasteful number, since it uses less digits than its factorization.

13123656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2035 (or 2028 counting only the distinct ones).

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

The square root of 13123656 is about 3622.6586921762. The cubic root of 13123656 is about 235.8766472099.

Adding to 13123656 its reverse (65632131), we get a palindrome (78755787).

The spelling of 13123656 in words is "thirteen million, one hundred twenty-three thousand, six hundred fifty-six".