1388286665 has 16 divisors (see below), whose sum is σ = 1674730512. Its totient is φ = 1104789504.

The previous prime is 1388286649. The next prime is 1388286701. The reversal of 1388286665 is 5666828831.

It can be written as a sum of positive squares in 8 ways, for example, as 8832784 + 1379453881 = 2972^2 + 37141^2 .

It is a cyclic number.

It is not a de Polignac number, because 1388286665 - 2⁴ = 1388286649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1140137 + ... + 1141353.

It is an arithmetic number, because the mean of its divisors is an integer number (104670657).

Almost surely, 2^1388286665 is an apocalyptic number.

It is an amenable number.

1388286665 is a deficient number, since it is larger than the sum of its proper divisors (286443847).

1388286665 is a wasteful number, since it uses less digits than its factorization.

1388286665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2236.

The product of its digits is 3317760, while the sum is 53.

The square root of 1388286665 is about 37259.7190676473. The cubic root of 1388286665 is about 1115.5603007514.

The spelling of 1388286665 in words is "one billion, three hundred eighty-eight million, two hundred eighty-six thousand, six hundred sixty-five".