1391338727 has 4 divisors (see below), whose sum is σ = 1391991936. Its totient is φ = 1390685520.

The previous prime is 1391338723. The next prime is 1391338801. The reversal of 1391338727 is 7278331931.

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

It is a cyclic number.

It is not a de Polignac number, because 1391338727 - 2² = 1391338723 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391338723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323399 + ... + 327672.

It is an arithmetic number, because the mean of its divisors is an integer number (347997984).

Almost surely, 2^1391338727 is an apocalyptic number.

1391338727 is a deficient number, since it is larger than the sum of its proper divisors (653209).

1391338727 is an equidigital number, since it uses as much as digits as its factorization.

1391338727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653208.

The product of its digits is 190512, while the sum is 44.

The square root of 1391338727 is about 37300.6531712248. The cubic root of 1391338727 is about 1116.3771990863.

The spelling of 1391338727 in words is "one billion, three hundred ninety-one million, three hundred thirty-eight thousand, seven hundred twenty-seven".