913809 has 8 divisors (see below), whose sum is σ = 1312192. Its totient is φ = 562320.

The previous prime is 913799. The next prime is 913811. The reversal of 913809 is 908319.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 913809 - 2¹³ = 905617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (913889) 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 7 ways as a sum of consecutive naturals, for example, 11677 + ... + 11754.

It is an arithmetic number, because the mean of its divisors is an integer number (164024).

2⁹¹³⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

913809 is a deficient number, since it is larger than the sum of its proper divisors (398383).

913809 is a wasteful number, since it uses less digits than its factorization.

913809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23447.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 913809 is about 955.9335750982. The cubic root of 913809 is about 97.0402284692.

The spelling of 913809 in words is "nine hundred thirteen thousand, eight hundred nine".