918789 has 4 divisors (see below), whose sum is σ = 1225056. Its totient is φ = 612524.

The previous prime is 918787. The next prime is 918793. The reversal of 918789 is 987819.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 918789 - 2¹ = 918787 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 918789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (918787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153129 + ... + 153134.

It is an arithmetic number, because the mean of its divisors is an integer number (306264).

2⁹¹⁸⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

918789 is a deficient number, since it is larger than the sum of its proper divisors (306267).

918789 is a wasteful number, since it uses less digits than its factorization.

918789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306266.

The product of its digits is 36288, while the sum is 42.

The square root of 918789 is about 958.5348193989. The cubic root of 918789 is about 97.2161897875.

The spelling of 918789 in words is "nine hundred eighteen thousand, seven hundred eighty-nine".