1388785 has 4 divisors (see below), whose sum is σ = 1666548. Its totient is φ = 1111024.

The previous prime is 1388773. The next prime is 1388789. The reversal of 1388785 is 5878831.

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 323761 + 1065024 = 569^2 + 1032^2 .

It is a cyclic number.

It is not a de Polignac number, because 1388785 - 2¹⁷ = 1257713 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

1388785 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1388789) 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, 138874 + ... + 138883.

It is an arithmetic number, because the mean of its divisors is an integer number (416637).

2^1388785 is an apocalyptic number.

It is an amenable number.

1388785 is a deficient number, since it is larger than the sum of its proper divisors (277763).

1388785 is an equidigital number, since it uses as much as digits as its factorization.

1388785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277762.

The product of its digits is 53760, while the sum is 40.

The square root of 1388785 is about 1178.4672248306. The cubic root of 1388785 is about 111.5693764118.

The spelling of 1388785 in words is "one million, three hundred eighty-eight thousand, seven hundred eighty-five".