1386720065 has 4 divisors (see below), whose sum is σ = 1664064084. Its totient is φ = 1109376048.

The previous prime is 1386720061. The next prime is 1386720089. The reversal of 1386720065 is 5600276831.

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 557337664 + 829382401 = 23608^2 + 28799^2 .

It is a cyclic number.

It is not a de Polignac number, because 1386720065 - 2² = 1386720061 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1386720061) 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, 138672002 + ... + 138672011.

It is an arithmetic number, because the mean of its divisors is an integer number (416016021).

Almost surely, 2^1386720065 is an apocalyptic number.

It is an amenable number.

1386720065 is a deficient number, since it is larger than the sum of its proper divisors (277344019).

1386720065 is an equidigital number, since it uses as much as digits as its factorization.

1386720065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277344018.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 1386720065 is about 37238.6904307872. The cubic root of 1386720065 is about 1115.1405280459.

Adding to 1386720065 its reverse (5600276831), we get a palindrome (6986996896).

The spelling of 1386720065 in words is "one billion, three hundred eighty-six million, seven hundred twenty thousand, sixty-five".