804918391 has 2 divisors, whose sum is σ = 804918392. Its totient is φ = 804918390.

The previous prime is 804918383. The next prime is 804918449. The reversal of 804918391 is 193819408.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 804918391 - 2³ = 804918383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (804918371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402459195 + 402459196.

It is an arithmetic number, because the mean of its divisors is an integer number (402459196).

Almost surely, 2^804918391 is an apocalyptic number.

804918391 is a deficient number, since it is larger than the sum of its proper divisors (1).

804918391 is an equidigital number, since it uses as much as digits as its factorization.

804918391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 804918391 is about 28371.0837121179. The cubic root of 804918391 is about 930.2163103424.

The spelling of 804918391 in words is "eight hundred four million, nine hundred eighteen thousand, three hundred ninety-one".