800865803 has 2 divisors, whose sum is σ = 800865804. Its totient is φ = 800865802.

The previous prime is 800865787. The next prime is 800865847. The reversal of 800865803 is 308568008.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 800865803 - 2⁴ = 800865787 is a prime.

It is not a weakly prime, because it can be changed into another prime (800865883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400432901 + 400432902.

It is an arithmetic number, because the mean of its divisors is an integer number (400432902).

Almost surely, 2^800865803 is an apocalyptic number.

800865803 is a deficient number, since it is larger than the sum of its proper divisors (1).

800865803 is an equidigital number, since it uses as much as digits as its factorization.

800865803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 800865803 is about 28299.5724879370. The cubic root of 800865803 is about 928.6525377773.

The spelling of 800865803 in words is "eight hundred million, eight hundred sixty-five thousand, eight hundred three".