804816538 has 4 divisors (see below), whose sum is σ = 1207224810. Its totient is φ = 402408268.

The previous prime is 804816521. The next prime is 804816539. The reversal of 804816538 is 835618408.

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., 427951969 + 376864569 = 20687^2 + 19413^2 .

It is a junction number, because it is equal to n+sod(n) for n = 804816494 and 804816503.

It is not an unprimeable number, because it can be changed into a prime (804816539) by changing a digit.

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, 201204133 + ... + 201204136.

Almost surely, 2^804816538 is an apocalyptic number.

804816538 is a deficient number, since it is larger than the sum of its proper divisors (402408272).

804816538 is a wasteful number, since it uses less digits than its factorization.

804816538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402408271.

The product of its (nonzero) digits is 184320, while the sum is 43.

The square root of 804816538 is about 28369.2886410639. The cubic root of 804816538 is about 930.1770726923.

The spelling of 804816538 in words is "eight hundred four million, eight hundred sixteen thousand, five hundred thirty-eight".