1388705 has 4 divisors (see below), whose sum is σ = 1666452. Its totient is φ = 1110960.

The previous prime is 1388701. The next prime is 1388719. The reversal of 1388705 is 5078831.

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 1008016 + 380689 = 1004^2 + 617^2 .

It is not a de Polignac number, because 1388705 - 2² = 1388701 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1388701) 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, 138866 + ... + 138875.

It is an arithmetic number, because the mean of its divisors is an integer number (416613).

2^1388705 is an apocalyptic number.

It is an amenable number.

1388705 is a deficient number, since it is larger than the sum of its proper divisors (277747).

1388705 is an equidigital number, since it uses as much as digits as its factorization.

1388705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277746.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 1388705 is about 1178.4332819468. The cubic root of 1388705 is about 111.5672340784.

The spelling of 1388705 in words is "one million, three hundred eighty-eight thousand, seven hundred five".