1328721234 has 8 divisors (see below), whose sum is σ = 2657442480. Its totient is φ = 442907076.

The previous prime is 1328721211. The next prime is 1328721239. The reversal of 1328721234 is 4321278231.

1328721234 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

1328721234 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 1328721195 and 1328721204.

It is not an unprimeable number, because it can be changed into a prime (1328721239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110726764 + ... + 110726775.

It is an arithmetic number, because the mean of its divisors is an integer number (332180310).

Almost surely, 2^1328721234 is an apocalyptic number.

1328721234 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1328721234 is a wasteful number, since it uses less digits than its factorization.

1328721234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221453544.

The product of its digits is 16128, while the sum is 33.

The square root of 1328721234 is about 36451.6286878927. The cubic root of 1328721234 is about 1099.3718821742.

Adding to 1328721234 its reverse (4321278231), we get a palindrome (5649999465).

The spelling of 1328721234 in words is "one billion, three hundred twenty-eight million, seven hundred twenty-one thousand, two hundred thirty-four".