813814857 has 20 divisors (see below), whose sum is σ = 1225286656. Its totient is φ = 538264440.

The previous prime is 813814853. The next prime is 813814909. The reversal of 813814857 is 758418318.

It is a happy number.

It is not a de Polignac number, because 813814857 - 2² = 813814853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813814853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 29269 + ... + 49842.

Almost surely, 2^813814857 is an apocalyptic number.

It is an amenable number.

813814857 is a deficient number, since it is larger than the sum of its proper divisors (411471799).

813814857 is a wasteful number, since it uses less digits than its factorization.

813814857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79250 (or 79241 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 813814857 is about 28527.4404214609. The cubic root of 813814857 is about 933.6308736593.

The spelling of 813814857 in words is "eight hundred thirteen million, eight hundred fourteen thousand, eight hundred fifty-seven".