840440803 has 2 divisors, whose sum is σ = 840440804. Its totient is φ = 840440802.

The previous prime is 840440791. The next prime is 840440807. The reversal of 840440803 is 308044048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840440803 - 2⁵ = 840440771 is a prime.

It is equal to p_43116853 and since 840440803 and 43116853 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (840440807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420220401 + 420220402.

It is an arithmetic number, because the mean of its divisors is an integer number (420220402).

Almost surely, 2^840440803 is an apocalyptic number.

840440803 is a deficient number, since it is larger than the sum of its proper divisors (1).

840440803 is an equidigital number, since it uses as much as digits as its factorization.

840440803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 31.

The square root of 840440803 is about 28990.3570692049. The cubic root of 840440803 is about 943.7038127302.

The spelling of 840440803 in words is "eight hundred forty million, four hundred forty thousand, eight hundred three".