1388005 has 4 divisors (see below), whose sum is σ = 1665612. Its totient is φ = 1110400.

The previous prime is 1388003. The next prime is 1388011. The reversal of 1388005 is 5008831.

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 986049 + 401956 = 993^2 + 634^2 .

It is not a de Polignac number, because 1388005 - 2¹ = 1388003 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 (1388003) 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, 138796 + ... + 138805.

It is an arithmetic number, because the mean of its divisors is an integer number (416403).

2^1388005 is an apocalyptic number.

It is an amenable number.

1388005 is a deficient number, since it is larger than the sum of its proper divisors (277607).

1388005 is an equidigital number, since it uses as much as digits as its factorization.

1388005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277606.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 1388005 is about 1178.1362399994. The cubic root of 1388005 is about 111.5484851506.

The spelling of 1388005 in words is "one million, three hundred eighty-eight thousand, five".