1328781459 has 4 divisors (see below), whose sum is σ = 1771708616. Its totient is φ = 885854304.

The previous prime is 1328781451. The next prime is 1328781469. The reversal of 1328781459 is 9541878231.

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

It is not a de Polignac number, because 1328781459 - 2³ = 1328781451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1328781451) 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, 221463574 + ... + 221463579.

It is an arithmetic number, because the mean of its divisors is an integer number (442927154).

Almost surely, 2^1328781459 is an apocalyptic number.

1328781459 is a deficient number, since it is larger than the sum of its proper divisors (442927157).

1328781459 is an equidigital number, since it uses as much as digits as its factorization.

1328781459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442927156.

The product of its digits is 483840, while the sum is 48.

The square root of 1328781459 is about 36452.4547733071. The cubic root of 1328781459 is about 1099.3884917959.

The spelling of 1328781459 in words is "one billion, three hundred twenty-eight million, seven hundred eighty-one thousand, four hundred fifty-nine".