123685856 has 48 divisors (see below), whose sum is σ = 280145376. Its totient is φ = 52655616.

The previous prime is 123685847. The next prime is 123685873. The reversal of 123685856 is 658586321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33410 + ... + 36926.

It is an arithmetic number, because the mean of its divisors is an integer number (5836362).

Almost surely, 2^123685856 is an apocalyptic number.

123685856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123685856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140072688).

123685856 is an abundant number, since it is smaller than the sum of its proper divisors (156459520).

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

123685856 is a wasteful number, since it uses less digits than its factorization.

123685856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3691 (or 3683 counting only the distinct ones).

The product of its digits is 345600, while the sum is 44.

The square root of 123685856 is about 11121.4142985503. The cubic root of 123685856 is about 498.2416315295.

The spelling of 123685856 in words is "one hundred twenty-three million, six hundred eighty-five thousand, eight hundred fifty-six".