123428219 has 4 divisors (see below), whose sum is σ = 124214544. Its totient is φ = 122641896.

The previous prime is 123428213. The next prime is 123428231. The reversal of 123428219 is 912824321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123428219 - 2⁴ = 123428203 is a prime.

It is a super-2 number, since 2×123428219² = 30469050491023922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123428213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 392927 + ... + 393240.

It is an arithmetic number, because the mean of its divisors is an integer number (31053636).

Almost surely, 2^123428219 is an apocalyptic number.

123428219 is a deficient number, since it is larger than the sum of its proper divisors (786325).

123428219 is an equidigital number, since it uses as much as digits as its factorization.

123428219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786324.

The product of its digits is 6912, while the sum is 32.

The square root of 123428219 is about 11109.8253361608. The cubic root of 123428219 is about 497.8954461346.

The spelling of 123428219 in words is "one hundred twenty-three million, four hundred twenty-eight thousand, two hundred nineteen".