804688139 has 2 divisors, whose sum is σ = 804688140. Its totient is φ = 804688138.

The previous prime is 804688121. The next prime is 804688151. The reversal of 804688139 is 931886408.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 804688139 - 2⁸ = 804687883 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 804688093 and 804688102.

It is not a weakly prime, because it can be changed into another prime (804688169) 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, 402344069 + 402344070.

It is an arithmetic number, because the mean of its divisors is an integer number (402344070).

Almost surely, 2^804688139 is an apocalyptic number.

804688139 is a deficient number, since it is larger than the sum of its proper divisors (1).

804688139 is an equidigital number, since it uses as much as digits as its factorization.

804688139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 331776, while the sum is 47.

The square root of 804688139 is about 28367.0255578550. The cubic root of 804688139 is about 930.1276037959.

The spelling of 804688139 in words is "eight hundred four million, six hundred eighty-eight thousand, one hundred thirty-nine".