1386663391 has 4 divisors (see below), whose sum is σ = 1434479400. Its totient is φ = 1338847384.

The previous prime is 1386663389. The next prime is 1386663401. The reversal of 1386663391 is 1933666831.

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 1386663391 - 2¹ = 1386663389 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 (1386663991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23907961 + ... + 23908018.

It is an arithmetic number, because the mean of its divisors is an integer number (358619850).

Almost surely, 2^1386663391 is an apocalyptic number.

1386663391 is a deficient number, since it is larger than the sum of its proper divisors (47816009).

1386663391 is an equidigital number, since it uses as much as digits as its factorization.

1386663391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47816008.

The product of its digits is 419904, while the sum is 46.

The square root of 1386663391 is about 37237.9294671441. The cubic root of 1386663391 is about 1115.1253362427.

The spelling of 1386663391 in words is "one billion, three hundred eighty-six million, six hundred sixty-three thousand, three hundred ninety-one".