1209828 has 24 divisors (see below), whose sum is σ = 2892960. Its totient is φ = 393280.

The previous prime is 1209821. The next prime is 1209841. The reversal of 1209828 is 8289021.

1209828 is nontrivially palindromic in base 8.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 1209795 and 1209804.

It is not an unprimeable number, because it can be changed into a prime (1209821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 738 + ... + 1721.

It is an arithmetic number, because the mean of its divisors is an integer number (120540).

2^1209828 is an apocalyptic number.

It is an amenable number.

1209828 is an abundant number, since it is smaller than the sum of its proper divisors (1683132).

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

1209828 is a wasteful number, since it uses less digits than its factorization.

1209828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2507 (or 2505 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1209828 is about 1099.9218154033. The cubic root of 1209828 is about 106.5551743028. Note that the first 3 decimals are identical.

The spelling of 1209828 in words is "one million, two hundred nine thousand, eight hundred twenty-eight".