123817842 has 16 divisors (see below), whose sum is σ = 275150880. Its totient is φ = 41272596.

The previous prime is 123817801. The next prime is 123817843. The reversal of 123817842 is 248718321.

It is a junction number, because it is equal to n+sod(n) for n = 123817797 and 123817806.

It is not an unprimeable number, because it can be changed into a prime (123817843) 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, 1146408 + ... + 1146515.

It is an arithmetic number, because the mean of its divisors is an integer number (17196930).

Almost surely, 2^123817842 is an apocalyptic number.

123817842 is an abundant number, since it is smaller than the sum of its proper divisors (151333038).

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

123817842 is a wasteful number, since it uses less digits than its factorization.

123817842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2292934 (or 2292928 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 123817842 is about 11127.3465839795. The cubic root of 123817842 is about 498.4187941808.

The spelling of 123817842 in words is "one hundred twenty-three million, eight hundred seventeen thousand, eight hundred forty-two".