1388663 has 4 divisors (see below), whose sum is σ = 1392528. Its totient is φ = 1384800.

The previous prime is 1388659. The next prime is 1388669. The reversal of 1388663 is 3668831.

It is a happy number.

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 1388663 - 2² = 1388659 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 (1388669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1331 + ... + 2132.

It is an arithmetic number, because the mean of its divisors is an integer number (348132).

2^1388663 is an apocalyptic number.

1388663 is a deficient number, since it is larger than the sum of its proper divisors (3865).

1388663 is an equidigital number, since it uses as much as digits as its factorization.

1388663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3864.

The product of its digits is 20736, while the sum is 35.

The square root of 1388663 is about 1178.4154615415. The cubic root of 1388663 is about 111.5661093205.

The spelling of 1388663 in words is "one million, three hundred eighty-eight thousand, six hundred sixty-three".