1388659 has 2 divisors, whose sum is σ = 1388660.
Its totient is φ = 1388658.
The previous prime is 1388641. The next prime is 1388669. The reversal of 1388659 is 9568831.
It is a happy number.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 1388659 - 25 = 1388627 is a prime.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (1388669) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694329 + 694330.
It is an arithmetic number, because the mean of its divisors is an integer number (694330).
21388659 is an apocalyptic number.
1388659 is a deficient number, since it is larger than the sum of its proper divisors (1).
1388659 is an equidigital number, since it uses as much as digits as its factorization.
1388659 is an evil number, because the sum of its binary digits is even.
The product of its digits is 51840, while the sum is 40.
The square root of 1388659 is about 1178.4137643460.
The cubic root of 1388659 is about 111.5660021995.
The spelling of 1388659 in words is "one million, three hundred eighty-eight thousand, six hundred fifty-nine".