1328929 has 12 divisors (see below), whose sum is σ = 1589844. Its totient is φ = 1106784.

The previous prime is 1328927. The next prime is 1328953. The reversal of 1328929 is 9298231.

It can be written as a sum of positive squares in 2 ways, for example, as 1254400 + 74529 = 1120^2 + 273^2 .

It is not a de Polignac number, because 1328929 - 2¹ = 1328927 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1328894 and 1328903.

It is not an unprimeable number, because it can be changed into a prime (1328923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1447 + ... + 2179.

It is an arithmetic number, because the mean of its divisors is an integer number (132487).

2^1328929 is an apocalyptic number.

It is an amenable number.

1328929 is a deficient number, since it is larger than the sum of its proper divisors (260915).

1328929 is an equidigital number, since it uses as much as digits as its factorization.

1328929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784 (or 777 counting only the distinct ones).

The product of its digits is 7776, while the sum is 34.

The square root of 1328929 is about 1152.7918285623. The cubic root of 1328929 is about 109.9429180422.

The spelling of 1328929 in words is "one million, three hundred twenty-eight thousand, nine hundred twenty-nine".