123821828 has 12 divisors (see below), whose sum is σ = 233356620. Its totient is φ = 57148512.

The previous prime is 123821813. The next prime is 123821849. The reversal of 123821828 is 828128321.

It can be written as a sum of positive squares in 2 ways, for example, as 73582084 + 50239744 = 8578^2 + 7088^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1190543 + ... + 1190646.

It is an arithmetic number, because the mean of its divisors is an integer number (19446385).

Almost surely, 2^123821828 is an apocalyptic number.

It is an amenable number.

123821828 is a deficient number, since it is larger than the sum of its proper divisors (109534792).

123821828 is a wasteful number, since it uses less digits than its factorization.

123821828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2381206 (or 2381204 counting only the distinct ones).

The product of its digits is 12288, while the sum is 35.

The square root of 123821828 is about 11127.5256908263. The cubic root of 123821828 is about 498.4241425645.

The spelling of 123821828 in words is "one hundred twenty-three million, eight hundred twenty-one thousand, eight hundred twenty-eight".