811838387 has 4 divisors (see below), whose sum is σ = 811957920. Its totient is φ = 811718856.

The previous prime is 811838381. The next prime is 811838399. The reversal of 811838387 is 783838118.

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

It is a cyclic number.

It is not a de Polignac number, because 811838387 - 2⁴ = 811838371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (811838381) 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, 48923 + ... + 63380.

It is an arithmetic number, because the mean of its divisors is an integer number (202989480).

Almost surely, 2^811838387 is an apocalyptic number.

811838387 is a deficient number, since it is larger than the sum of its proper divisors (119533).

811838387 is a wasteful number, since it uses less digits than its factorization.

811838387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119532.

The product of its digits is 258048, while the sum is 47.

The square root of 811838387 is about 28492.7778042086. Note that the first 3 decimals coincide. The cubic root of 811838387 is about 932.8744406402.

The spelling of 811838387 in words is "eight hundred eleven million, eight hundred thirty-eight thousand, three hundred eighty-seven".