811388 has 12 divisors (see below), whose sum is σ = 1440432. Its totient is φ = 399840.

The previous prime is 811387. The next prime is 811411. The reversal of 811388 is 883118.

It is a happy number.

811388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 811388.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 811388.

It is not an unprimeable number, because it can be changed into a prime (811387) 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, 1145 + ... + 1712.

It is an arithmetic number, because the mean of its divisors is an integer number (120036).

2⁸¹¹³⁸⁸ is an apocalyptic number.

It is an amenable number.

811388 is a deficient number, since it is larger than the sum of its proper divisors (629044).

811388 is a wasteful number, since it uses less digits than its factorization.

811388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2932 (or 2930 counting only the distinct ones).

The product of its digits is 1536, while the sum is 29.

The square root of 811388 is about 900.7707810536. The cubic root of 811388 is about 93.2701897168.

The spelling of 811388 in words is "eight hundred eleven thousand, three hundred eighty-eight".