123020218 has 4 divisors (see below), whose sum is σ = 184530330. Its totient is φ = 61510108.

The previous prime is 123020207. The next prime is 123020221. The reversal of 123020218 is 812020321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 812020321 = 7 ⋅116002903.

It can be written as a sum of positive squares in only one way, i.e., 119968209 + 3052009 = 10953^2 + 1747^2 .

It is a junction number, because it is equal to n+sod(n) for n = 123020195 and 123020204.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30755053 + ... + 30755056.

Almost surely, 2^123020218 is an apocalyptic number.

123020218 is a deficient number, since it is larger than the sum of its proper divisors (61510112).

123020218 is an equidigital number, since it uses as much as digits as its factorization.

123020218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61510111.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 123020218 is about 11091.4479667895. The cubic root of 123020218 is about 497.3462306015.

Adding to 123020218 its reverse (812020321), we get a palindrome (935040539).

The spelling of 123020218 in words is "one hundred twenty-three million, twenty thousand, two hundred eighteen".