1209128032 has 96 divisors (see below), whose sum is σ = 2916006912. Its totient is φ = 482194944.

The previous prime is 1209128027. The next prime is 1209128047. The reversal of 1209128032 is 2308219021.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187453 + ... + 193795.

It is an arithmetic number, because the mean of its divisors is an integer number (30375072).

Almost surely, 2^1209128032 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 1209128032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1458003456).

1209128032 is an abundant number, since it is smaller than the sum of its proper divisors (1706878880).

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

1209128032 is a wasteful number, since it uses less digits than its factorization.

1209128032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6420 (or 6412 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1209128032 is about 34772.5183442327. The cubic root of 1209128032 is about 1065.3462052685.

The spelling of 1209128032 in words is "one billion, two hundred nine million, one hundred twenty-eight thousand, thirty-two".