804138291 has 24 divisors (see below), whose sum is σ = 1277618160. Its totient is φ = 487349280.

The previous prime is 804138287. The next prime is 804138299. The reversal of 804138291 is 192831408.

804138291 is a `hidden beast` number, since 80 + 413 + 82 + 91 = 666.

It is not a de Polignac number, because 804138291 - 2² = 804138287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (804138299) 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 in 23 ways as a sum of consecutive naturals, for example, 21586 + ... + 45543.

It is an arithmetic number, because the mean of its divisors is an integer number (53234090).

Almost surely, 2^804138291 is an apocalyptic number.

804138291 is a deficient number, since it is larger than the sum of its proper divisors (473479869).

804138291 is a wasteful number, since it uses less digits than its factorization.

804138291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67168 (or 67143 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 804138291 is about 28357.3322264278. The cubic root of 804138291 is about 929.9157016897.

Adding to 804138291 its reverse (192831408), we get a palindrome (996969699).

The spelling of 804138291 in words is "eight hundred four million, one hundred thirty-eight thousand, two hundred ninety-one".