811399 has 4 divisors (see below), whose sum is σ = 814320. Its totient is φ = 808480.

The previous prime is 811387. The next prime is 811411. The reversal of 811399 is 993118.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (811387) and next prime (811411).

It is a cyclic number.

It is not a de Polignac number, because 811399 - 2¹³ = 803207 is a prime.

It is a Duffinian number.

811399 is a lucky number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 811399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 994 + ... + 1615.

It is an arithmetic number, because the mean of its divisors is an integer number (203580).

2⁸¹¹³⁹⁹ is an apocalyptic number.

811399 is a deficient number, since it is larger than the sum of its proper divisors (2921).

811399 is a wasteful number, since it uses less digits than its factorization.

811399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2920.

The product of its digits is 1944, while the sum is 31.

The square root of 811399 is about 900.7768869148. The cubic root of 811399 is about 93.2706112034.

The spelling of 811399 in words is "eight hundred eleven thousand, three hundred ninety-nine".