1328867391 has 8 divisors (see below), whose sum is σ = 1865077120. Its totient is φ = 839284632.

The previous prime is 1328867369. The next prime is 1328867437. The reversal of 1328867391 is 1937688231.

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

It is not a de Polignac number, because 1328867391 - 2⁶ = 1328867327 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1328867391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328867341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11656675 + ... + 11656788.

It is an arithmetic number, because the mean of its divisors is an integer number (233134640).

Almost surely, 2^1328867391 is an apocalyptic number.

1328867391 is a deficient number, since it is larger than the sum of its proper divisors (536209729).

1328867391 is a wasteful number, since it uses less digits than its factorization.

1328867391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23313485.

The product of its digits is 435456, while the sum is 48.

The square root of 1328867391 is about 36453.6334403033. The cubic root of 1328867391 is about 1099.4121903544.

The spelling of 1328867391 in words is "one billion, three hundred twenty-eight million, eight hundred sixty-seven thousand, three hundred ninety-one".