123820042 has 8 divisors (see below), whose sum is σ = 186364836. Its totient is φ = 61698432.

The previous prime is 123820033. The next prime is 123820049. The reversal of 123820042 is 240028321.

It can be written as a sum of positive squares in 2 ways, for example, as 104468841 + 19351201 = 10221^2 + 4399^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 123819995 and 123820022.

It is not an unprimeable number, because it can be changed into a prime (123820049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105063 + ... + 106234.

Almost surely, 2^123820042 is an apocalyptic number.

123820042 is a deficient number, since it is larger than the sum of its proper divisors (62544794).

123820042 is a wasteful number, since it uses less digits than its factorization.

123820042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211592.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 123820042 is about 11127.4454390934. The cubic root of 123820042 is about 498.4217461378.

Adding to 123820042 its reverse (240028321), we get a palindrome (363848363).

The spelling of 123820042 in words is "one hundred twenty-three million, eight hundred twenty thousand, forty-two".