918389 has 2 divisors, whose sum is σ = 918390. Its totient is φ = 918388.

The previous prime is 918371. The next prime is 918397. The reversal of 918389 is 983819.

918389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 917764 + 625 = 958^2 + 25^2 .

It is an emirp because it is prime and its reverse (983819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 918389 - 2¹² = 914293 is a prime.

It is an Ulam number.

It is a plaindrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (918319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459194 + 459195.

It is an arithmetic number, because the mean of its divisors is an integer number (459195).

2⁹¹⁸³⁸⁹ is an apocalyptic number.

It is an amenable number.

918389 is a deficient number, since it is larger than the sum of its proper divisors (1).

918389 is an equidigital number, since it uses as much as digits as its factorization.

918389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 38.

The square root of 918389 is about 958.3261449006. The cubic root of 918389 is about 97.2020798665.

The spelling of 918389 in words is "nine hundred eighteen thousand, three hundred eighty-nine".