123509828 has 48 divisors (see below), whose sum is σ = 254467584. Its totient is φ = 51909120.

The previous prime is 123509819. The next prime is 123509851. The reversal of 123509828 is 828905321.

It is a super-2 number, since 2×123509828² = 30509355225179168, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123509791 and 123509800.

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 15 ways as a sum of consecutive naturals, for example, 25151 + ... + 29657.

It is an arithmetic number, because the mean of its divisors is an integer number (5301408).

Almost surely, 2^123509828 is an apocalyptic number.

It is an amenable number.

123509828 is an abundant number, since it is smaller than the sum of its proper divisors (130957756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123509828 is a wasteful number, since it uses less digits than its factorization.

123509828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4572 (or 4570 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 123509828 is about 11113.4975592745. The cubic root of 123509828 is about 498.0051557774.

The spelling of 123509828 in words is "one hundred twenty-three million, five hundred nine thousand, eight hundred twenty-eight".