813940197 has 32 divisors (see below), whose sum is σ = 1252737024. Its totient is φ = 460468800.

The previous prime is 813940189. The next prime is 813940199. The reversal of 813940197 is 791049318.

It is a happy number.

It is not a de Polignac number, because 813940197 - 2³ = 813940189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813940199) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1231047 + ... + 1231707.

It is an arithmetic number, because the mean of its divisors is an integer number (39148032).

Almost surely, 2^813940197 is an apocalyptic number.

It is an amenable number.

813940197 is a deficient number, since it is larger than the sum of its proper divisors (438796827).

813940197 is a wasteful number, since it uses less digits than its factorization.

813940197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 813940197 is about 28529.6371690914. The cubic root of 813940197 is about 933.6788023684.

The spelling of 813940197 in words is "eight hundred thirteen million, nine hundred forty thousand, one hundred ninety-seven".