840646699 has 2 divisors, whose sum is σ = 840646700. Its totient is φ = 840646698.

The previous prime is 840646679. The next prime is 840646769. The reversal of 840646699 is 996646048.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 840646699 - 2⁹ = 840646187 is a prime.

It is not a weakly prime, because it can be changed into another prime (840646679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420323349 + 420323350.

It is an arithmetic number, because the mean of its divisors is an integer number (420323350).

Almost surely, 2^840646699 is an apocalyptic number.

840646699 is a deficient number, since it is larger than the sum of its proper divisors (1).

840646699 is an equidigital number, since it uses as much as digits as its factorization.

840646699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 52.

The square root of 840646699 is about 28993.9079635706. The cubic root of 840646699 is about 943.7808710923.

The spelling of 840646699 in words is "eight hundred forty million, six hundred forty-six thousand, six hundred ninety-nine".