1209172328 has 128 divisors (see below), whose sum is σ = 3027870720. Its totient is φ = 439050240.

The previous prime is 1209172301. The next prime is 1209172343. The reversal of 1209172328 is 8232719021.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 506225 + ... + 508607.

It is an arithmetic number, because the mean of its divisors is an integer number (23655240).

Almost surely, 2^1209172328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1209172328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1513935360).

1209172328 is an abundant number, since it is smaller than the sum of its proper divisors (1818698392).

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

1209172328 is a wasteful number, since it uses less digits than its factorization.

1209172328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2467 (or 2463 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1209172328 is about 34773.1552781740. The cubic root of 1209172328 is about 1065.3592146433.

The spelling of 1209172328 in words is "one billion, two hundred nine million, one hundred seventy-two thousand, three hundred twenty-eight".