819377018 has 4 divisors (see below), whose sum is σ = 1229065530. Its totient is φ = 409688508.

The previous prime is 819376993. The next prime is 819377021. The reversal of 819377018 is 810773918.

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

It can be written as a sum of positive squares in only one way, i.e., 706868569 + 112508449 = 26587^2 + 10607^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 819377018.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204844253 + ... + 204844256.

Almost surely, 2^819377018 is an apocalyptic number.

819377018 is a deficient number, since it is larger than the sum of its proper divisors (409688512).

819377018 is a wasteful number, since it uses less digits than its factorization.

819377018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409688511.

The product of its (nonzero) digits is 84672, while the sum is 44.

The square root of 819377018 is about 28624.7623221574. The cubic root of 819377018 is about 935.7530676987.

The spelling of 819377018 in words is "eight hundred nineteen million, three hundred seventy-seven thousand, eighteen".