123128419 has 4 divisors (see below), whose sum is σ = 123458896. Its totient is φ = 122797944.

The previous prime is 123128389. The next prime is 123128441. The reversal of 123128419 is 914821321.

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 123128419 - 2¹³ = 123120227 is a prime.

It is a super-2 number, since 2×123128419² = 30321215130879122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123128459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164679 + ... + 165424.

It is an arithmetic number, because the mean of its divisors is an integer number (30864724).

Almost surely, 2^123128419 is an apocalyptic number.

123128419 is a deficient number, since it is larger than the sum of its proper divisors (330477).

123128419 is an equidigital number, since it uses as much as digits as its factorization.

123128419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330476.

The product of its digits is 3456, while the sum is 31.

The square root of 123128419 is about 11096.3245716769. The cubic root of 123128419 is about 497.4919995683.

The spelling of 123128419 in words is "one hundred twenty-three million, one hundred twenty-eight thousand, four hundred nineteen".