123128841 has 32 divisors (see below), whose sum is σ = 191116800. Its totient is φ = 69684480.

The previous prime is 123128813. The next prime is 123128843. The reversal of 123128841 is 148821321.

It is not a de Polignac number, because 123128841 - 2⁹ = 123128329 is a prime.

It is a super-2 number, since 2×123128841² = 30321422972006562, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123128799 and 123128808.

It is not an unprimeable number, because it can be changed into a prime (123128843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77190 + ... + 78768.

It is an arithmetic number, because the mean of its divisors is an integer number (5972400).

Almost surely, 2^123128841 is an apocalyptic number.

123128841 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123128841 is a deficient number, since it is larger than the sum of its proper divisors (67987959).

123128841 is a wasteful number, since it uses less digits than its factorization.

123128841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1749.

The product of its digits is 3072, while the sum is 30.

The square root of 123128841 is about 11096.3435869659. The cubic root of 123128841 is about 497.4925679218.

The spelling of 123128841 in words is "one hundred twenty-three million, one hundred twenty-eight thousand, eight hundred forty-one".