1388813 has 4 divisors (see below), whose sum is σ = 1396668. Its totient is φ = 1380960.

The previous prime is 1388797. The next prime is 1388819. The reversal of 1388813 is 3188831.

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 334084 + 1054729 = 578^2 + 1027^2 .

It is a cyclic number.

It is not a de Polignac number, because 1388813 - 2⁴ = 1388797 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1388813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388819) 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, 3656 + ... + 4017.

It is an arithmetic number, because the mean of its divisors is an integer number (349167).

2^1388813 is an apocalyptic number.

It is an amenable number.

1388813 is a deficient number, since it is larger than the sum of its proper divisors (7855).

1388813 is an equidigital number, since it uses as much as digits as its factorization.

1388813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7854.

The product of its digits is 4608, while the sum is 32.

The square root of 1388813 is about 1178.4791046090. The cubic root of 1388813 is about 111.5701262091.

The spelling of 1388813 in words is "one million, three hundred eighty-eight thousand, eight hundred thirteen".