819986195 has 16 divisors (see below), whose sum is σ = 1134509760. Its totient is φ = 557297664.

The previous prime is 819986191. The next prime is 819986197. The reversal of 819986195 is 591689918.

It is not a de Polignac number, because 819986195 - 2² = 819986191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 819986195.

It is not an unprimeable number, because it can be changed into a prime (819986191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99710 + ... + 107619.

It is an arithmetic number, because the mean of its divisors is an integer number (70906860).

Almost surely, 2^819986195 is an apocalyptic number.

819986195 is a deficient number, since it is larger than the sum of its proper divisors (314523565).

819986195 is a wasteful number, since it uses less digits than its factorization.

819986195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207454.

The product of its digits is 1399680, while the sum is 56.

The square root of 819986195 is about 28635.4010797823. The cubic root of 819986195 is about 935.9849097057.

The spelling of 819986195 in words is "eight hundred nineteen million, nine hundred eighty-six thousand, one hundred ninety-five".