819241394 has 4 divisors (see below), whose sum is σ = 1228862094. Its totient is φ = 409620696.

The previous prime is 819241343. The next prime is 819241399. The reversal of 819241394 is 493142918.

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., 815388025 + 3853369 = 28555^2 + 1963^2 .

It is not an unprimeable number, because it can be changed into a prime (819241399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204810347 + ... + 204810350.

Almost surely, 2^819241394 is an apocalyptic number.

819241394 is a deficient number, since it is larger than the sum of its proper divisors (409620700).

819241394 is a wasteful number, since it uses less digits than its factorization.

819241394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409620699.

The product of its digits is 62208, while the sum is 41.

The square root of 819241394 is about 28622.3932262835. The cubic root of 819241394 is about 935.7014359614.

The spelling of 819241394 in words is "eight hundred nineteen million, two hundred forty-one thousand, three hundred ninety-four".