918909 has 6 divisors (see below), whose sum is σ = 1327326. Its totient is φ = 612600.

The previous prime is 918899. The next prime is 918913. The reversal of 918909 is 909819.

It can be written as a sum of positive squares in only one way, i.e., 562500 + 356409 = 750^2 + 597^2 .

It is not a de Polignac number, because 918909 - 2⁵ = 918877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (918949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 51042 + ... + 51059.

It is an arithmetic number, because the mean of its divisors is an integer number (221221).

2⁹¹⁸⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

918909 is a deficient number, since it is larger than the sum of its proper divisors (408417).

918909 is a wasteful number, since it uses less digits than its factorization.

918909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102107 (or 102104 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 918909 is about 958.5974128903. The cubic root of 918909 is about 97.2204219652.

The spelling of 918909 in words is "nine hundred eighteen thousand, nine hundred nine".