1388641 has 2 divisors, whose sum is σ = 1388642.
Its totient is φ = 1388640.
The previous prime is 1388633. The next prime is 1388659. The reversal of 1388641 is 1468831.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 893025 + 495616 = 945^2 + 704^2
It is a cyclic number.
It is not a de Polignac number, because 1388641 - 23 = 1388633 is a prime.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (1388041) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694320 + 694321.
It is an arithmetic number, because the mean of its divisors is an integer number (694321).
21388641 is an apocalyptic number.
It is an amenable number.
1388641 is a deficient number, since it is larger than the sum of its proper divisors (1).
1388641 is an equidigital number, since it uses as much as digits as its factorization.
1388641 is an evil number, because the sum of its binary digits is even.
The product of its digits is 4608, while the sum is 31.
The square root of 1388641 is about 1178.4061269359.
The cubic root of 1388641 is about 111.5655201525.
The spelling of 1388641 in words is "one million, three hundred eighty-eight thousand, six hundred forty-one".