811191740 has 12 divisors (see below), whose sum is σ = 1703502696. Its totient is φ = 324476688.

The previous prime is 811191709. The next prime is 811191763. The reversal of 811191740 is 47191118.

It is a junction number, because it is equal to n+sod(n) for n = 811191697 and 811191706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20279774 + ... + 20279813.

It is an arithmetic number, because the mean of its divisors is an integer number (141958558).

Almost surely, 2^811191740 is an apocalyptic number.

It is an amenable number.

811191740 is an abundant number, since it is smaller than the sum of its proper divisors (892310956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

811191740 is a wasteful number, since it uses less digits than its factorization.

811191740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40559596 (or 40559594 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 32.

The square root of 811191740 is about 28481.4279838634. The cubic root of 811191740 is about 932.6266898958.

The spelling of 811191740 in words is "eight hundred eleven million, one hundred ninety-one thousand, seven hundred forty".