804390787 has 2 divisors, whose sum is σ = 804390788. Its totient is φ = 804390786.

The previous prime is 804390733. The next prime is 804390791. The reversal of 804390787 is 787093408.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-804390787 is a prime.

It is not a weakly prime, because it can be changed into another prime (804390287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402195393 + 402195394.

It is an arithmetic number, because the mean of its divisors is an integer number (402195394).

Almost surely, 2^804390787 is an apocalyptic number.

804390787 is a deficient number, since it is larger than the sum of its proper divisors (1).

804390787 is an equidigital number, since it uses as much as digits as its factorization.

804390787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 804390787 is about 28361.7839178004. The cubic root of 804390787 is about 930.0130213616.

The spelling of 804390787 in words is "eight hundred four million, three hundred ninety thousand, seven hundred eighty-seven".