813409 has 8 divisors (see below), whose sum is σ = 884480. Its totient is φ = 745200.

The previous prime is 813401. The next prime is 813419. The reversal of 813409 is 904318.

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

It is a cyclic number.

It is not a de Polignac number, because 813409 - 2³ = 813401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102 + ... + 1279.

It is an arithmetic number, because the mean of its divisors is an integer number (110560).

2⁸¹³⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

813409 is a deficient number, since it is larger than the sum of its proper divisors (71071).

813409 is a wasteful number, since it uses less digits than its factorization.

813409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 813409 is about 901.8919003961. The cubic root of 813409 is about 93.3475644400.

Subtracting 813409 from its reverse (904318), we obtain a palindrome (90909).

The spelling of 813409 in words is "eight hundred thirteen thousand, four hundred nine".