840335801 has 2 divisors, whose sum is σ = 840335802. Its totient is φ = 840335800.

The previous prime is 840335791. The next prime is 840335831. The reversal of 840335801 is 108533048.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 733109776 + 107226025 = 27076^2 + 10355^2 .

It is a cyclic number.

It is not a de Polignac number, because 840335801 - 2²² = 836141497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (840335831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420167900 + 420167901.

It is an arithmetic number, because the mean of its divisors is an integer number (420167901).

Almost surely, 2^840335801 is an apocalyptic number.

It is an amenable number.

840335801 is a deficient number, since it is larger than the sum of its proper divisors (1).

840335801 is an equidigital number, since it uses as much as digits as its factorization.

840335801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 840335801 is about 28988.5460311482. The cubic root of 840335801 is about 943.6645099761.

Adding to 840335801 its reverse (108533048), we get a palindrome (948868849).

The spelling of 840335801 in words is "eight hundred forty million, three hundred thirty-five thousand, eight hundred one".