1328813473 has 4 divisors (see below), whose sum is σ = 1431029908. Its totient is φ = 1226597040.

The previous prime is 1328813459. The next prime is 1328813501. The reversal of 1328813473 is 3743188231.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 840536064 + 488277409 = 28992^2 + 22097^2 .

It is a cyclic number.

It is not a de Polignac number, because 1328813473 - 2¹⁷ = 1328682401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1328813413) 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, 51108198 + ... + 51108223.

It is an arithmetic number, because the mean of its divisors is an integer number (357757477).

Almost surely, 2^1328813473 is an apocalyptic number.

1328813473 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1328813473 is a deficient number, since it is larger than the sum of its proper divisors (102216435).

1328813473 is a wasteful number, since it uses less digits than its factorization.

1328813473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102216434.

The product of its digits is 96768, while the sum is 40.

The square root of 1328813473 is about 36452.8938906090. The cubic root of 1328813473 is about 1099.3973208225.

The spelling of 1328813473 in words is "one billion, three hundred twenty-eight million, eight hundred thirteen thousand, four hundred seventy-three".