123856842 has 16 divisors (see below), whose sum is σ = 255704832. Its totient is φ = 39953760.

The previous prime is 123856841. The next prime is 123856847. The reversal of 123856842 is 248658321.

It is a self number, because there is not a number n which added to its sum of digits gives 123856842.

It is not an unprimeable number, because it can be changed into a prime (123856841) 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, 332763 + ... + 333134.

It is an arithmetic number, because the mean of its divisors is an integer number (15981552).

Almost surely, 2^123856842 is an apocalyptic number.

123856842 is an abundant number, since it is smaller than the sum of its proper divisors (131847990).

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

123856842 is a wasteful number, since it uses less digits than its factorization.

123856842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665933.

The product of its digits is 92160, while the sum is 39.

The square root of 123856842 is about 11129.0988853546. The cubic root of 123856842 is about 498.4711191450.

The spelling of 123856842 in words is "one hundred twenty-three million, eight hundred fifty-six thousand, eight hundred forty-two".